Documenting importing my BTRFS pool from another server - Stable kernel, btrfsprogs, and more

@kageurufu wrote:

I am migrating a a 10 disk pool from my prior DIY storage server to my new Rockstor server.

The old pool is a RAID6 with metadata stored in RAID1C4, which requires Linux 5.5+ to mount, obviously newer than even Leap 15.3, so I went down the rabbit-hole on installing a backported kernel on Leap 15.2. Here’s my documentation

Per https://doc.opensuse.org/documentation/leap/reference/html/book-reference/cha-tuning-multikernel.html#sec-tuning-multikernel-latest, I ensured that /etc/zypp/zypp.conf contains the following

multiversion = provides:multiversion(kernel)
multiversion.kernels = latest,latest-1,latest-2,latest-3,running

latest-2 and -3 might be overkill, but I’d strongly prefer having a bootable server instead of saving a little disk space for now. I intend to research this more, and see if I can specify latest from Leap_15_2, latest from kernel-stable-backport-repo somehow.

I had to find a kernel to install, preferrably on the Open Build Service. I chose https://build.opensuse.org/project/show/Kernel:stable:Backport. I also searched for a newer version of btrfsprogs, and found it available in https://build.opensuse.org/project/show/filesystems

To add the repos, I logged in over ssh and did the following

$ zypper addrepo \
    https://download.opensuse.org/repositories/Kernel:/stable:/Backport/standard \
    kernel-stable-backport-repo
$ zypper addrepo \
    https://download.opensuse.org/repositories/filesystems/openSUSE_Leap_15.2/ \
    filesystems-repo
$ zypper refresh

I searched the repos for a new kernel-default, at a more modern version. I truncated the output tables here to only show relevant rows.

$ zypper search kernel-default
S  | Name                           | Type       | Version                        | Arch   | Repository
---+--------------------------------+------------+--------------------------------+--------+----------------------------
v  | kernel-default                 | package    | 5.13.12-lp153.6.1.g33df9c6     | x86_64 | kernel-stable-backport-repo
i+ | kernel-default                 | package    | 5.3.18-lp152.87.1              | x86_64 |     Leap_15_2_Updates
i+ | kernel-default                 | package    | 5.3.18-lp152.19.2              | x86_64 | Leap_15_2

$ zypper search -s btrfsprogs
S  | Name                        | Type       | Version            | Arch   | Repository
---+-----------------------------+------------+--------------------+--------+------------------
v  | btrfsprogs                  | package    | 5.13.1-lp152.347.2 | x86_64 | filesystems-repo
i+ | btrfsprogs                  | package    | 4.19.1-lp152.6.3.1 | x86_64 | Leap_15_2_Updates
v  | btrfsprogs-udev-rules       | package    | 5.13.1-lp152.347.2 | noarch | filesystems-repo
i  | btrfsprogs-udev-rules       | package    | 4.19.1-lp152.6.3.1 | noarch | Leap_15_2_Updates
$ zypper install kernel-default-5.13.12-lp153.6.1.g33df9c6 btrfsprogs-5.13.1 btrfsprogs-udev-rules-5.13.1

This also pulled in kernel-firmware-all, crda, and wireless-regdb. I don’t have wifi on the server, but I don’t know zypper or opensuse well enough to be comfortable excluding these.

Rebooted and I was able to import the pool. A little manual cleanup for errant files and paths floating around in the btrfs root subvolume, and everything seems great.

Rockstor doesn’t know about RAID1C3 yet, but that’s not a huge problem. I might have to tweak a few things over time to keep this working right, but I’m happy.

I’d love some feedback on all this, I didn’t deal with migrating rockons and just recreated them instead.

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