Tag: NAS

Media Server Upgrade 2022 (Part 2)

In the first part of this post, I talked about making sure all the new hardware that I recently purchased works. Yesterday, upgrading from Ubuntu 20.04 LTS to 22.04 LTS was super simple. Unfortunately, that was the end of the easy part.

I thought I could just image by old boot drive and make a carbon copy of it on my new boot drive. My old boot drive is a simple SATA 512GB SSD, and my new boot drive is an NVMe M.2 1TB SSD plugged directly to the motherboard. The copying was pretty simple, but because the drives differ in size, I had to relayout the partition table with the new drive once the copy is completed. I did this with the parted command.

Unfortunately the new boot drive did not want to boot. At this point I had to do some research. The most helpful articles were:

Both of the above articles were an excellent refresher on how GRUB works. I have used GRUB since the beginning, but one gets super rusty when these types of tasks are only performed once every three or six years!

Instead of detailing what went wrong, I will just explain what I should have done. This way if I need it again in the future, it is here for my reference.

Step 1: Perform a backup of the old boot drive from a Live USB in shell mode. This is done on my server on a nightly basis. This method is clearly described on the Ubuntu Community Help Wiki.

Following this method I will end up with a compressed tar archive for my entire root directory, skipping some runtime and other unwanted directories.

Step 2: After installing a fresh install of the new Ubuntu LTS Server operating system on the new server and boot drive, I proceeded to backup the new boot with the same technique used in Step 1. I stored the backup of the new install on another external SSD drive that I have lying around. Also it is important that new boot drive partition layout of the new install contains a swap partition.

Step 3: I then restore the most recent backup (done in Step 1) of the old boot drive to the new boot drive. I then replaced the /boot/grub directory with the new contents from the new install which was backed up in Step 2. The new GRUB is already installed when we performed a brand new installation on the drive. We just want to make sure the boot partition matches the /boot/grub contents.

Step 4: We also need to fix up the /etc/fstab file because it contains references to drive devices from the old hardware. Paid special attention the main data partition and the swap partition. It should look something like this:

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/nvme1n1p2 during curtin installation
UUID=fc939be4-5292-4252-8120-7ef59b177e5b / ext4 defaults 0 1

# /boot/efi was on /dev/nvme0n1p1 during curtin installation
UUID=5187-A8C6 /boot/efi vfat defaults 0 1

# Swap partition
UUID=512d611e-6944-4a57-9748-ea68e9ec3fad	none	swap	sw	0	0

# /dev/mapper/airvideovg2-airvideo /mnt/airvideo ext4 rw,noatime 0 0
UUID=9e78425c-c1f3-4285-9fa1-96cac9114c55 /mnt/airvideo ext4 rw,noatime 0 0

Noticed that I also added the LVM logical volume for /mnt/airvideo, which is my RAID-1 array. The UUID can be obtained by the blkid command. Below is a sample output:

% blkid
/dev/sdf1: UUID="60024298-9915-3ad8-ae6c-ed7adc98ee62" UUID_SUB="fe08d23c-8e11-e02b-63f9-1bb806046db7" LABEL="avs:4" TYPE="linux_raid_member" PARTLABEL="primary" PARTUUID="552bdff7-182f-40f0-a378-844fdb549f07"
/dev/nvme0n1p1: UUID="r2rLMD-BEnc-wcza-yvro-chkB-1vB6-6Jtzgz" TYPE="LVM2_member" PARTLABEL="primary" PARTUUID="6c85af69-19a0-4720-9588-808bc0d818f7"
/dev/sdd1: UUID="34c6a19f-98ea-0188-bb3f-a5f5c3be238d" UUID_SUB="4174d106-cae4-d934-3ed4-5057531acb3c" LABEL="avs:3" TYPE="linux_raid_member" PARTLABEL="primary" PARTUUID="2fc4e9ad-be4b-48aa-8115-f32472e61005"
/dev/sdb1: UUID="ac438ac6-344a-656b-387f-017036b0fafa" UUID_SUB="0924dc67-cd3f-dec5-1814-ab46ebdf2fbe" LABEL="avs:1" TYPE="linux_raid_member" PARTUUID="29e7cfce-9e7b-4067-a0ca-453b39e0bd3d"
/dev/md4: UUID="gjbtdL-homY-wyRG-rUBw-lFgm-t0vZ-Gi8gSz" TYPE="LVM2_member"
/dev/md2: UUID="0Nky5e-52t6-b1uZ-GAIl-4Ior-XWTz-wFpHh1" TYPE="LVM2_member"
/dev/sdi1: UUID="5b483ac2-5b7f-4951-84b2-08adc602f705" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="data" PARTUUID="e0515517-9fbb-4d8a-88ad-674622f20e00"
/dev/sdg1: UUID="3d1afb64-8785-74e6-f9be-b68600eebdd5" UUID_SUB="c146cd05-8ee8-5804-b921-6d87cdd4a092" LABEL="avs:2" TYPE="linux_raid_member" PARTLABEL="lvm" PARTUUID="2f25ec17-83c4-4c0b-8653-600283d58109"
/dev/sde1: UUID="34c6a19f-98ea-0188-bb3f-a5f5c3be238d" UUID_SUB="8aabfe5b-af16-6e07-17c2-3f3ceb1514e3" LABEL="avs:3" TYPE="linux_raid_member" PARTLABEL="primary" PARTUUID="2fc4e9ad-be4b-48aa-8115-f32472e61005"
/dev/sdc1: UUID="ac438ac6-344a-656b-387f-017036b0fafa" UUID_SUB="c188f680-01a8-d5b2-f8bc-9f1cc1fc3598" LABEL="avs:1" TYPE="linux_raid_member" PARTUUID="29e7cfce-9e7b-4067-a0ca-453b39e0bd3d"
/dev/nvme1n1p2: UUID="fc939be4-5292-4252-8120-7ef59b177e5b" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="912e805d-fe68-48f8-b845-9bba0e3e8c78"
/dev/nvme1n1p3: UUID="512d611e-6944-4a57-9748-ea68e9ec3fad" TYPE="swap" PARTLABEL="swap" PARTUUID="04ac46ff-74f3-499a-814d-32082f6596d2"
/dev/nvme1n1p1: UUID="5187-A8C6" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="fe91a6b2-9cd3-46af-813a-b053a181af52"
/dev/sda1: UUID="3d1afb64-8785-74e6-f9be-b68600eebdd5" UUID_SUB="87fe80a1-4a79-67f3-273e-949e577dd5ee" LABEL="avs:2" TYPE="linux_raid_member" PARTUUID="c8dce45e-5134-4957-aee9-769fa9d11d1f"
/dev/md3: UUID="XEJI0m-PEmZ-VFiI-o4h0-bnQc-Y3Be-3QHB9n" TYPE="LVM2_member"
/dev/md1: UUID="usz0sA-yO01-tlPL-12j2-2C5r-Ukhc-9RLCaX" TYPE="LVM2_member"
/dev/mapper/airvideovg2-airvideo: UUID="9e78425c-c1f3-4285-9fa1-96cac9114c55" BLOCK_SIZE="4096" TYPE="ext4"
/dev/sdh1: UUID="60024298-9915-3ad8-ae6c-ed7adc98ee62" UUID_SUB="a1291844-6587-78b0-fcd1-65bc367068e5" LABEL="avs:4" TYPE="linux_raid_member" PARTLABEL="primary" PARTUUID="ed0274b9-21dc-49bf-bdda-566b2727ddc2"

Step 4B (Potentially): If the system boots in the “grub>” prompt, then we will have persuade grub to manually boot by providing the following at the prompt:

grub> set root=(hd9,gpt2)
grub> linux /boot/vmlinuz root=/dev/nvme1n1p2
grub> initrd /boot/initrd.img
grub> boot

To find the root value on the first line, you have use the ls command which is explained in this article. The root parameter on the linux line references the partition which the root directory is mounted. In my case, it was /dev/nvme1n1p2.

After I rebooted, I reinstalled GRUB with the following as super user:

grub-install /dev/nvme1n1

It may also be required to update our initramfs using:

update-initramfs -c -k all

Step 5: At this point the system should reboot and all of the old server’s content should now be on the old hardware. Unfortunately we will need to fix the network interface.

First obtain the MAC address of the network interface using:

% sudo lshw -C network | grep serial   
    serial: 04:42:1a:05:d3:c4

And then we will have to edit the /etc/netplan/00-installer-config.yaml file.

% cat /etc/netplan/00-installer-config.yaml 
# This is the network config written by 'subiquity'
network:
  ethernets:
    enp6s0:
      dhcp4: true
      match:
        macaddress: 04:42:1a:05:d3:c4
      set-name: enp6s0
  version: 2

Ensuring the MAC address matches from lshw and that the name is the same as the old system. The name in this example is enp6s0. We then need to execute the following commands to generate the interface.

netplan generate
netplan apply

We need to ensure the name matches because many services on the server have configurations that references the interface name, such as:

Configurations in /var/network/interfaces
Samba (SMB) (/etc/samba/smb.conf)
Pihole (/etc/pihole/setupVars.conf)
Homebridge (/var/lib/homebridge/config.json)

Step 6: Fix the router provisioning DHCP IP addresses so that the new server has the same fixed IP address as the old server. This is important because there may be firewall rules referencing this IP address directly. The hostname should have been automatically restored when we restored the partition in Step 3.

Step 7: Our final step is to test the various services and ensure they are working properly. These include:

Mail
Our web site lufamily.ca
Homebridge
Plex
Pihole (DNS server)
SMB (File sharing)

Finally the new system is completed!

Media Server Upgrade 2022

On May 15th, 2019 (more than three years ago), I performed a performance boost to my media server by upgrading its CPU, Motherboard, and Memory. You can read that experience in this post.

Today, I am going to be doing the same. It looks like we are on a cadence of every 3 years or so to do a spec bump. This time around we are also changing the same items, but will include the power supply as well in the swap. I also decided to swap the boot drive hardware from an old SSD drive to an NVME drive. All of this resulted in the following hardware acquisitions, all from Amazon, which I find them to have lower pricing (when factoring free shipping through Prime), than Newegg even during Black Friday and Cyber Monday offers.

AMD Ryzen 7 5700G 8-Core, 16-Thread Unlocked Desktop Processor with Radeon Graphics
ASUS TUF GAMING B550-PLUS AMD AM4 (3rd Gen Ryzen™)
G.SKILL Ripjaws V Series DDR4 3600MHz 32GB(16GBx2) Memory Kit
ASUS ROG Strix 850W Gold PSU
Samsung 980 PRO SSD 1TB – M.2 NVMe

The above totalled $1045.60 CAD.

The plan is to spend the time today to roughly test out all the new hardware.

I quickly did a skeleton setup to make sure Ubuntu 22.04.01 Server Edition works with all hardware involved, especially the networking.

Once I know Ubuntu server is working good, I am now testing the server’s new 32GB DDR4 memory. This is running as I write this post and will let it run overnight.

The plan for tomorrow is to upgrade the current media server from Ubuntu 20.04.5 LTS to Ubuntu 22.04.1 LTS. Once this is done, I can then backup everything, and move the new hardware into the old casing and hope everything works.

Part 2

Another NAS Storage Upgrade

Our home Network Attached Storage (NAS) media server is going below 4 Terabytes of free space. The Seagate IronWolf 12TB hard drives were on sale with Amazon offering them below $300. I figure that I swap out two old 6TB drives with these new 12TB drives resulting in a net increase of a further 6TB of storage.

The last time this was done was around two years ago when I replaced 4TB and 6TB hard drives with 10TB hard drives.

So far the mdadm and LVM storage architecture has proven to be very flexible. I am able to mix drives of different sizes and able to grow our media storage volume over time.

Previously I had to make two swaps, each swap for each drive in the array. Effectively I am changing two 6TB drives for two 12TB drives because they are in a Raid 1 array. I cannot swap both at the same time, because I have to incrementally sync the data from the old drives to the new ones.

This has always been inconvenient because it means opening the physical server twice. However, this time I used my USB 3.0 HDD dock. I inserted one of two 12TB new drives into the dock, and then I temporarily created a three disks Raid 1 array. Once the sync is completed, which took 10+ hours, I remove one 6TB drive from the array configuration and I then physically replace both 6TB drives with both 12TB new drives in the server chassis, and place one old 6TB drive into the dock. The 6TB drive in the dock is the one that is still in the array configuration. I then add the second 12TB drive that is already in the server chassis to the three disk array. Once again, a sync is required to accommodate the second 12TB drive. This also took 10+ hours. Once the second sync is completed, I can finally remove the second 6TB drive in the dock from the array and have the array returned back to a two disk Raid 1 array.

The above description is probably quite confusing, but this technique allowed me to just have a single down time for the server instead of two when swapping hard drives in the server chassis.

There will be an additional downtime when I grow or resize the LVM volume and file system.

After this upgrade I should have the following Raid 1 (fully mirrored) arrays:

An array with 2 x 8TB
An array with 2 x 10TB
An array with 2 x 10TB
An array with 2 x 12TB

The above four arrays are combined into a logical volume using LVM that results in a total volume size of 40TB (fully mirrored) or a little over 36TiB of usable space (increasing from the old 31TiB).

% df -h
Filesystem                        Size  Used Avail Use% Mounted on
udev                              7.7G     0  7.7G   0% /dev
tmpfs                             1.6G  3.4M  1.6G   1% /run
/dev/sdj1                         454G   64G  367G  15% /
tmpfs                             7.7G   37M  7.7G   1% /dev/shm
tmpfs                             5.0M  4.0K  5.0M   1% /run/lock
tmpfs                             7.7G     0  7.7G   0% /sys/fs/cgroup
/dev/mapper/airvideovg2-airvideo   37T   26T  9.1T  74% /mnt/airvideo
tmpfs                             1.6G     0  1.6G   0% /run/user/997
tmpfs                             1.6G     0  1.6G   0% /run/user/1000
/dev/sda1                         5.5T  548G  4.7T  11% /mnt/6tb

As you can see from above, the /mnt/airvideo now has 9.1TiB free!

The NAS motherboard and CPU is now over three years old. I may give it a couple of more years before considering another hardware upgrade.

Resizing LVM Volume with Cache

I had to increase the size of my media LVM logical volume again. In a previous post, I provided the instructions. I have done this many times. However, this time around, I ran into a snag.

Apparently this is the first time I try to increase the logical volume after I implemented LVM caching, which I wrote about in this post.

The steps in the “Linux LVM Super Simple to Expand” post are the same right up to and including the step involving the resizing of the physical volume. Afterwards, in order to resize the logical volume, we first have to disable the cache temporarily.

sudo lvconvert --splitcache /dev/airvideovg2/airvideo

Once the logical volume is no longer cached, then we can proceed with the resizing.

sudo lvresize -l +100%FREE /dev/airvideovg2/airvideo

Once the resize is completed, we can unmount the volume and perform the required resizing of the filesystem.

sudo systemctl stop smbd.service

sudo systemctl stop mpd.service

sudo systemctl stop apache2.service

sudo umount /mnt/airvideo

sudo e2fsck -y -f /dev/airvideovg2/airvideo

sudo resize2fs -p /dev/airvideovg2/airvideo

Note that e2fsck and resize2fs will take some time, between thirty minutes to an hour each. Once the file system is resized, we can reattach the cache.

sudo lvconvert --type cache --cachepool airvideovg2/lv_cache airvideovg2/airvideo

Usually it is a good idea to reboot the server after this just to make sure it mounts properly.

This is a small snag and LVM is still super simple to expand.

NAS RAID-1 Fail

This past weekend my media NAS server was intolerably slow. When I investigated, I found out that one of the RAID-1 partitions is experiencing read errors and is timing out. I decided to risk a reboot and to my surprise the RAID-1 partition did not recover with one fail drive, but mdstat recorded with an inactive status, something like this:

md2 : inactive sdc1[0](S)

After some Google search, I found that I had to do the following to resurrect the md2 device.

madam --stop /dev/md2
mdadm --assemble --force /dev/md2

This reactivated the md2 partition. I replaced the failed drive and re-added the new drive to the md2 device. The RAID-1 partition is now rebuilding.

The inactive state is a new experience for me, so this was a bit of a surprise.

During this exercise I also found out that the SATA connectors on my SATA add-on card were loose causing intermittent connections. I will have to find a way to address this in the future.

Media Server Upgrade

Two and half years ago, I performed a CPU and motherboard upgrade to my media server. You can read the account here.

Although the AMD Athlon 5350 APU was energy efficient, it proved to be under power for on demand video encoding when Plex wanted to transcode video for a player on a device that is not compatible with the playing video. For example, when an Apple TV (not 4K) wants to play 4K material from Plex on my media server, the server will have to transcode the 4K material to a compatible 1080p format. Unfortunately, this is very CPU intensive and if more than one person in the house hold is trying to do the same thing, which is not unheard of, this causes stuttered playback issues.

Given the choice between saving a few dollars a year versus usability, I choose usability. Therefore I started to research what I need for the upgrade. My goal is upgrade the system so that transcoding will not be an issue and I can also use the system for future video encoding of security camera footages. We can also use the system for background video encoding of family videos as well.

I continue to prefer the AMD brand, and decided on the following combo:

AMD Ryzen 5 2400G Processor with Radeon RX Vega 11 Graphics (YD2400C5FBBOX)
GIGABYTE B450 AORUS M Motherboard
Corsair Vengeance LPX 16GB (2x8GB) DDR4 DRAM 2666MHz (CMK16GX4M2A2666C16)

The above were all purchased through Amazon and cost me a grand total of $473.24. The AMD CPU was the most expensive part costing almost $190.

Taking out the old motherboard and CPU combo and replacing them with the new parts went smoothly. The side SATA connectors bucked against one of my HDD chassis so I opted not to use them, and decided to connect all of my RAID SATA connectors to the SATA accessory card that I purchased and discussed in this post.

Last time I did an upgrade like this, the Ubuntu operating system had no problems and booted without any issues. Unfortunately, this time is very different. After the machine posted, Ubuntu booted into a blank, black screen. After some research, I learned to reboot the Ubuntu kernel with the nomodeset option. I learned to press and hold the shift key so that I can select the desired kernel that I wanted via the GRUB menu, and I learned to press the ‘e’ key in the GRUB menu to modify the boot options. Finally pressing F10 to boot with the custom changes (effective for only one time).

The above trick got me a login prompt. After I gained access to the command prompt, I noticed that the kernel did not recognize any ethernet devices. I now have a machine that is not connected to the network. After some more Internet research I found out that the current 4.15 Linux Kernel that I have is insufficient to run on the Raven Ridge architecture, the AMD code name for the Zen CPU and Vega GPU combination on a single chip. I have to upgrade to the 4.18 Linux Kernel.

However I cannot upgrade through the Internet, because the machine is not on the Internet. I have to download the Debian packages on a USB stick with another machine and manually install them. At this point, I learned that you cannot simply download a single package for this. I had to decide whether to go with the Linux Mainline Kernel packages or go with the Ubuntu HWE (Hardware Enablement) packages. After reading through Ubuntu’s LTS Enablement Stack article, I decided to HWE packages. I found the linux-generic-hwe packages and their prerequisites on pkgs.org. This took several iterations as I did not get all the dependent packages on the first try.

Once all the packages were installed, the machine booted without the need for the nomodeset option. However, the internet interface device was still not there. I had to run the command netpath, to find out that new motherboard’s ethernet device’s logical name was em1. To register the new logical name, I had to edit /etc/network/interfaces file.

Finally, the machine booted with an active ethernet connection. As a sanity check, I executed:

sudo apt-get install --install-recommends linux-generic-hwe-18.04

Ensuring that my new media server has all the required kernel packages. We are still not done. The IP address of the server has changed, because we now have a different MAC address, so the DHCP server provisioned a different IP. I tried to change the Unifi Controller to provision a static IP address to this new server but I was unsuccessful. I suspect that the new server is also running the Unifi Controller may have something to do with it. Since the IP address has changed, I needed to update the following configurations:

Firewall rules
Unifi Controller name space configurations
Samba configurations because we only allow for local machines to share

All of this took from 4:30pm to 11:00pm last night, 6.5 hours worth of hardware assembly, research with Google, trial and error, and finally success. I cannot imagine if Google and the super helpful community forums did not existed. Fingers crossed that the new media server will run smoothly.

More Home IT Upgrades

This past weekend I continued to upgrade our NAS server. Last weekend, I upgraded my raid array with an additional 8TB of mirrored storage. This yielded two old 4TB WD Blue HDD. I noticed that my case has a total of 9 internal storage bays. One was used by my 500GB SSD Boot Drive, and 6 were populated by HDD drives making up the current raid array. This means I have 2 more storage bays left. However these remaining bays were meant for 5.25″ storage devices like Optical Disc Players. For me to place my old 4TB WD Blue HDD into these bays, I will need a 5.25″ to 3.5″ bay converter. I had one, and purchased the other one on Amazon. I ended up buying the ORICO Aluminum 5.25 inch to 2.5 or 3.5 Inch Internal Hard Disk Drive Mounting Kit.

I also did not have enough SATA slots and purchased the IOCrest SI-PEX40071 SATA III 8 Port Controller Card. This card along with the 4 builtin SATA slots on the motherboard gave me enough SATA connections for my 9 drives.

Once I installed the old 4TB drives, I proceeded to create another md raid level 1 device and created a matching physical volume which I used to extend the current logical volume group. When the setup is completed, I ended up with a 20TB+ fully mirrored NAS server. I love LVM in combination of mdadm.

I figured while everything is fresh on my mind, I minus well proceed with the dreaded 16.04 to 18.04 Linux Ubuntu upgrade.

The upgrade was surprisingly very smooth. However the new version of OpenVPN caused some troubles. The new OpenVPN no longer works with my old PureVPN configuration files, because the certificate files that came from PureVPN used an outdated and deprecated hash algorithm. After getting the new configuration files from PureVPN, everything worked like a charm.

I also have to reinstall the Unifi Controller along with Let’s Encrypt certbot utility.

Super happy with the outcome and the upgrades should last another 2 to 3 years.

Two New 8TB Drive for Our NAS

Our NAS has run out of space again. I saw a deal that the Seagate IronWolf 8TB NAS Hard Drive was on sale at newegg for $309 CAD. I jumped at the chance and purchased two.

I am now following the same step as I outlined in this post. Replacing two old 4TB drives with these two new 8TB drives.

So far so good. Hopefully when all is said and done, my NAS will have a total of 18TB in a RAID 1 configuration of 6 hard drives in total. Two 4TB, two 6TB, and the two new 8TB.

I noticed that I could fit two more drives in my chassis and may decide to re-add the two old 4 TB back in, but first I’ll have to check if my power supply can handle the demand.

I really like this mdadm and LVM setup.

Update: After 2 mdadm syncs, each of which was around 8 hours, and a pvresize that also took another 5 hours. I had to convert the filesystem from 32 bits to 64 bits using these very helpful instructions. Only after I converted to 64 bits can I then expand the existing filesystem to more than 16TB. It was a learning and yet rewarding experience. Next step is to reuse the 2 old 4TB drives in the same chassis and add them to the logical volume.

Linux LVM Super Simple to Expand

During the Boxing Day sales event of 2017, I purchased a couple of Seagate Barracuda ST4000DM004 (4TB) hard drives. The intention is to expand our main home network storage, which is a network accessible / attached storage (NAS) managed by our Linux server using mdadm and Logical Volume Manager (LVM).

However I procrastinated until this weekend and finally performed the upgrade. The task went smoothly without any hiccups. I have to give due credit to the following site: https://raid.wiki.kernel.org/index.php/Growing. It really provided very detail information for me to follow. It was a great help.

One major concern I had was whether I can do this without any data loss, and a question of how much down time would this upgrade require.

I had a logical volume, named /dev/airvideovg2/airvideo, consisted of 100% usage of a volume group which was made up of three RAID-1 multiple devices (md). Since I ran out of physical drive bays, to perform the upgrade, I had to effectively replace 2 older drives which were 2TB in size with the newer 4TB drives. The old drives were Western Digital WDC WD20EZRX-00D8PB0 (2TB). I can use these old drives for other needs.

First I had to find the md containing the 2TB pair in RAID-1 (mirror) configuration. I did this with a combination of lsblk and mdadm commands. For example:

$ lsblk
NAME                       MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sdb                          8:0    0  1.8T  0 disk
└─sdb1                       8:1    0  1.8T  0 part
  └─md2                      9:3    0  1.8T  0 raid1
    └─airvideovg2-airvideo 252:0    0   10T  0 lvm   /mnt/airvideo

$ sudo mdadm --detail /dev/md2
/dev/md2:
        Version : 1.2
  Creation Time : Sat Nov 12 18:01:36 2016
     Raid Level : raid1
     Array Size : 1906885632 (1725.90 GiB 2000.65 GB)
  Used Dev Size : 1906885632 (1725.90 GiB 2000.65 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Sun Mar 11 09:12:05 2018
          State : clean 
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : avs:2  (local to host avs)
           UUID : 3d1afb64:878574e6:f9beb686:00eebdd5
         Events : 55191

    Number   Major   Minor   RaidDevice State
       2       8       81        0      active sync   /dev/sdf1
       3       8       17        1      active sync   /dev/sdb1

I found that I needed to replace /dev/md2 which consisted of two /dev/sdf1 and /dev/sdb1 partitions. These partitions belonged respectively to the old WD drives. I have 6 hard drives in the server chassis, so I needed to get the serial number of the drives to ensure that I was swapping the right one. I used the hdparm command to get serial number of /dev/sdb and /dev/sdf. For example:

$ sudo hdparm -i /dev/sdb

/dev/sdb:

 Model=WDC WD20EZRX-00D8PB0, FwRev=0001, SerialNo=WD-WCC4M4UDRZLD
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=7814037168
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6 
 AdvancedPM=no WriteCache=enabled
 Drive conforms to: unknown:  ATA/ATAPI-4,5,6,7

 * signifies the current active mode

Before I physically replace the drives, I must first remove them from the md device by doing the following.

sudo mdadm -f /dev/md2 /dev/sdb1
sudo mdadm -r /dev/md2 /dev/sdb1

After swapping out only one of the drives, and replaced it with a new one, I rebooted the machine. I first have to partitioned the new drive using the parted command.

sudo parted /dev/sdb

Once within parted, execute the following commands to create a single partition using the whole drive.

mklabel gpt
mkpart primary 2048s 100%

I learned that I can only start at sector 2048 to achieve optimal alignment. Once I created the /dev/sdb1 partition, I have to add it back into the RAID.

sudo mdadm --add /dev/md2 /dev/sdb1

As soon as the new partition with the new drive was added into the RAID, a drive resynchronization begins automatically. The resync took more than 3 hours. Once the resync is completed, I did the same thing with the remaining old drive in the RAID, and performed another resync. This time from the first new drive to the second new drive. After another 3+ hours, we can now grow the RAID device.

sudo mdadm --grow /dev/md2 --bitmap none
sudo mdadm --grow /dev/md2 --size max
sudo mdadm --wait /dev/md2
sudo mdadm --grow /dev/md2 --bitmap internal

The third command (–wait) took another 3+ hours to complete. After a full day of RAID resync, we now have the same /dev/md2 that is 4TB instead of 2TB in size. However the corresponding physical volume of LVM still needed to be resized. We did this with:

sudo pvresize /dev/md2

Once the physical volume is resized, we can then extend the logical volume to use up the remaining free space that we just added.

lvresize -l +100%FREE /dev/airvideovg2/airvideo

This took a few minutes but at least it was not 3+ hours.

Aside from the down time that I had to use to swap the hard drives, the logical volume was usable throughout the resynchronization and resizing process. This was impressive. However, now I have to take the volume offline by first umount the volume and changing it to inactive status.

sudo lvchange -an /dev/airvideovg2/airvideo

Note that I had stop the smbd and other services that was using the volume before I can unmount it.

The last step is to resize the file system of the logical volume, but before I can do that I was forced to perform a file system check.

e2fsck -f /dev/airvideovg2/airvideo
resize2fs -p /dev/airvideovg2/airvideo

I rebooted the machine to ensure all the new configurations held, and voila I upgraded my 8TB network attached storage to 10TB! Okay it was not super simple, but the upgrade process was pretty simple and painless. The down time was minimal. The LVM and mdadm guys did a really good job here.

Three Cheers for Software RAID

Last year, I built a NAS machine as referenced by my previous post here. This month, my media drive composed of an LVM logical volume of almost 5TB is almost filled.

This drive contains all purchased media and our home videos for Plex, as well as our time machine backups. To alleviate the storage shortage, I purchased two 4TB Western Digital WD40EFRX hard drives. This weekend I took the plunge and installed the two new drives into my NAS computer. In the spirit of the moment, without performing a backup, I proceeded to:

Use parted to partition the drives;
Use mdadm to create a RAID 1 device of the two drives;
Created a new LVM physical volume with the new RAID device;
Added the volume to the existing volume group;
Extend the logical volume to newly added 4TB;
and finally, Extend the ext4 file system to include the 4TB

In the end, I now have a near 9TB network drive that should last me for quite sometime.

In researching how to extend the logical volume, I also found out how I can upgrade my drives in my existing physical volumes to higher capacity drives without having to recopy everything to another drive first. This should come in handy in the future, because my NAS computer box has no more drive bays.

I know I probably should have taken a backup before this, but everything worked and I couldn’t be happier. Hurray, hurray, and hurray for software RAID.