Hi.
On Tue, Oct 06, 2015 at 08:53:58PM +0300, Reco wrote:
> Hi.
>
> On Tue, Oct 06, 2015 at 06:21:59PM +0100, Tony van der Hoff wrote:
> > On 06/10/15 17:59, Reco wrote:
> > >
> >
> > > Allow me to explain then.
> > >
> > Thank you, Reco, I'm really grateful. I'm learning a lot here!
>
> You're welcome.
>
> > OK, here goes:
> >
> > root@tony-lx:~# cat /proc/mdstat
> > Personalities : [raid1]
> > md6 : active raid1 sdb11[1]
> > 434672504 blocks super 1.2 [2/1] [_U]
> >
> > md5 : active (auto-read-only) raid1 sdb10[1]
> > 9763768 blocks super 1.2 [2/1] [_U]
> >
> > md4 : active raid1 sdb9[1]
> > 4880372 blocks super 1.2 [2/1] [_U]
> >
> > md3 : active raid1 sdb8[1]
> > 9763768 blocks super 1.2 [2/1] [_U]
> >
> > md2 : active raid1 sdb7[1]
> > 4880372 blocks super 1.2 [2/1] [_U]
> >
> > md1 : active raid1 sdb6[1]
> > 14646200 blocks super 1.2 [2/1] [_U]
> >
> > md0 : active raid1 sdb5[1]
> > 4880372 blocks super 1.2 [2/1] [_U]
> >
> > unused devices: <none>
>
> Whoops. You're using a degraded RAID1. Lots of them, actually.
> Glad I finally put my leet telepathy skills to some use (:evilgrin:).
>
> Your /etc/fstab looks OK.
> Your devices.map looks OK.
>
> Partition tables are also good, although some may consider different
> (yep, they really are) partition tables for RAID1 somewhat
> unconventional. But hey, if it worked for you - who am I to argue.
> Using only extended partitions is unconventional too,
> but if it did not prevent booting - that's OK for me.
>
> And now it's time to end this trouble once and for all.
>
> Easy way:
>
> 1) Those should work just fine, and fix the trouble somewhat:
>
> mdadm --add /dev/md0 /dev/sda5
> mdadm --add /dev/md1 /dev/sda6
> mdadm --add /dev/md3 /dev/sda8
> mdadm --add /dev/md4 /dev/sda9
> mdadm --add /dev/md6 /dev/sda11
>
> 2) A big warning - wait for RAID rebuild to finish before rebooting.
> Really. I mean it. Monitor the rebuild progress via /proc/mdstat.
>
> 3) Reboot to check that you're using correct kernel version.
>
> Which leaves us with /dev/md2 and /dev/md5.
> These use /dev/sdb7 and /dev/sdb10, respectively.
> Sadly, both have size 9999M, and their respective pairs (sda7 and sda10)
> have only 4999M, so you won't be able to add them to RAID1.
>
>
> Hard way:
>
> 1) Destroy partition table on /dev/sda ("parted rm", for example).
>
> 2) Copy partition table from /dev/sdb to /dev/sda ("parted mkpart").
> Ensure that both drives really have the same partition tables.
>
> 3) Add partitions from /dev/sda to respective RAIDs.
>
> 4) Wait for RAID rebuild to finish. That's really important part.
>
> 5) Re-install grub to /dev/sda just in case.
>
> 6) Reboot.
>
> 7) Check /proc/mdstat to ensure that there are no degraded RAIDs this
> time. Check kernel version while you're at it.
>
> 8) ...
>
> 9) Profit.
PS. Almost forgot it. Applies to both cases.
Update /etc/mdadm/mdadm.conf after RAID rebuild.
Update initrd after updating /etc/mdadm/mdadm.conf.
Reco
