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Re: [PATCH} Add RAID devices.
From: |
myglc2 |
Subject: |
Re: [PATCH} Add RAID devices. |
Date: |
Sat, 30 Jul 2016 19:05:25 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Andreas Enge <address@hidden> writes:
> the attached patch adds RAID support to our mapped device mechanism.
>
> To give more explanation:
> Like for LUKS devices or file systems, the RAID itself needs to be created
> during installation, after booting from the USB key:
> mdadm --create /dev/md0 --level=raid10 --layout=f2 \
> --raid-devices=2 /dev/sda2 /dev/sdb2
> (wait 12 hours or so for 4 TB disks)
> mkfs.ext4 /dev/md0
>
> Then one adds a mapped-device of type raid-device-mapping, adds the
> raid10 kernel module to the initrd and can boot from the RAID device.
> The mapped-device mechanism calls "mdadm --assemble" and "mdadm --stop".
>
> I might write a more detailed blog post about this; there is a little
> subtlety with the non-automatic determination of dependencies between
> devices, so one needs to make sure that the partitions to be assembled
> are present before the mdadm command is executed.
Thanks. Starting with baby steps, I am running GuixSD system from a
separate drive and adding raid1 array with 2 new disks. I created an
array that will assemble like so...
address@hidden ~$ sudo mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1
mdadm: /dev/md0 has been started with 2 drives.
address@hidden ~$ cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[0] sdb1[1]
239809536 blocks super 1.2 [2/2] [UU]
bitmap: 0/2 pages [0KB], 65536KB chunk
I added this to my config (system25.scm attached) ...
(operating-system
[...]
(initrd (lambda (fs . args)
(apply base-initrd fs
#:extra-modules '("raid1")
#:mapped-devices '((mapped-device
(source (list "/dev/sdb1" "/dev/sdc1"))
(target "/dev/md0")
(type raid-device-mapping)))
args)))
[...]
I rebooted and the array is not assembled ;-(
address@hidden ~$ cat /proc/mdstat
Personalities : [raid1]
unused devices: <none>
/var/log/messages contains ...
[...]
Jul 30 18:09:59 localhost vmunix: [ 1.872801] md: raid1 personality
registered for level 1
[...]
Any suggestions, corrections or a sample working config would be most welcome.
TIA - George
system25.scm
Description: Binary data
- Re: [PATCH] Add mdadm to the installation image., (continued)
Re: [PATCH] Add mdadm to the installation image., myglc2, 2016/07/15
Re: [PATCH} Add RAID devices.,
myglc2 <=
Re: [PATCH} Add RAID devices., Andreas Enge, 2016/07/31
Re: [PATCH} Add RAID devices., myglc2, 2016/07/31
Re: [PATCH} Add RAID devices., Andreas Enge, 2016/07/31