mounting /dev/hdax and xfs problems

mounting /dev/hdax and xfs problems

[Nerijus Baliunas]

Hello,

I have on debian /home mounted on raid1. Some time ago
it was remounted as 'mount /dev/hda2 /home' instead of
'mount /dev/md0 /home'. Now when I umount it and try
to mount /dev/md0, I see in dmesg:

XFS mounting filesystem md(9,0)
Starting XFS recovery on filesystem: md(9,0) (dev: 9/0)
XFS: dirty log written in incompatible format - can't recover
XFS: log mount/recovery failed
XFS: log mount failed

When mounting /dev/hda2 it succeeds. The question is -
does mounting part of raid1 mirror when raid is still running
do anything bad for a raid? How raid works in this situation -
is it still mirroring info from /dev/hda2 to /dev/hdb2?
If I raidstop and raidstart, can it damage filesystem?

/proc/mdstat shows that everything is OK.

Regards,
Nerijus

Re: mounting /dev/hdax and xfs problems

[Nerijus Baliunas]

Hello,

could plese someone answer my question? I am afraid if server
reboots, it might loose filesystem.

Nerijus

On Sun, 5 Oct 2003 02:26:02 +0300 (EEST) Nerijus Baliunas <nerijus@users.sourceforge.net> wrote:

> Hello,
> 
> I have on debian /home mounted on raid1. Some time ago
> it was remounted as 'mount /dev/hda2 /home' instead of
> 'mount /dev/md0 /home'. Now when I umount it and try
> to mount /dev/md0, I see in dmesg:
> 
> XFS mounting filesystem md(9,0)
> Starting XFS recovery on filesystem: md(9,0) (dev: 9/0)
> XFS: dirty log written in incompatible format - can't recover
> XFS: log mount/recovery failed
> XFS: log mount failed
> 
> When mounting /dev/hda2 it succeeds. The question is -
> does mounting part of raid1 mirror when raid is still running
> do anything bad for a raid? How raid works in this situation -
> is it still mirroring info from /dev/hda2 to /dev/hdb2?
> If I raidstop and raidstart, can it damage filesystem?
> 
> /proc/mdstat shows that everything is OK.

Re: mounting /dev/hdax and xfs problems

[Lars Marowsky-Bree]

On 2003-10-05T02:26:02,
   Nerijus Baliunas <nerijus@users.sourceforge.net> said:

> When mounting /dev/hda2 it succeeds. The question is -
> does mounting part of raid1 mirror when raid is still running
> do anything bad for a raid? How raid works in this situation -
> is it still mirroring info from /dev/hda2 to /dev/hdb2?
> If I raidstop and raidstart, can it damage filesystem?

Yes. Your data is toast.

You need to trigger a full resync from hda2 to hdb2 manually.

I think
	mdadm /dev/md0 -f /dev/hdb2 -r /dev/hdb2 -a /dev/hdb2

should do it.

You must NEVER modify an underlaying device of a raid set. This will
cause problems.


Sincerely,
    Lars Marowsky-Brée <lmb@suse.de>

-- 
High Availability & Clustering		ever tried. ever failed. no matter.
SuSE Labs				try again. fail again. fail better.
Research & Development, SUSE LINUX AG		-- Samuel Beckett

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