[mythtv-users] mdadm help, please
drescherjm at gmail.com
Sat Apr 25 05:29:59 UTC 2009
On Sat, Apr 25, 2009 at 1:06 AM, Joel Means <means.joel at gmail.com> wrote:
> On Fri, Apr 24, 2009 at 8:24 AM, Joel Means <means.joel at gmail.com> wrote:
>> Thanks, John. I have subscribed and will send my original message to the
>> linux-raid mailing list. I am willing to try any suggestions you may have
>> as well.
> Just an update. I found through a lot of googling that the problem
> was that I did not have large block device support compiled into my
> kernel (CONFIG_LBD). I set that to yes, recompiled, and now the raid
> shows up correctly. Unfortunately, it looks like my fiddling with the
> array did hose my filesystem. The array is currently rebuilding, but
> at the moment, running an fsck gives me this:
> # jfs_fsck -d -nv /dev/md0
> jfs_fsck version 1.1.12, 24-Aug-2007
> processing started: 4/24/2009 23.2.28
> The current device is: /dev/md0 [xchkdsk.c:1527]
> Open(...READONLY...) returned rc = 0 [fsckpfs.c:3199]
> Invalid magic number in the superblock (P). [fsckmeta.c:1944]
> Invalid magic number in the superblock (S). [fsckmeta.c:1944]
> The superblock does not describe a correct jfs file system.
> If device /dev/md0 is valid and contains a jfs file system,
> then both the primary and secondary superblocks are corrupt
> and cannot be repaired, and fsck cannot continue.
> Otherwise, make sure the entered device /dev/md0 is correct.
> Once it finishes rebuilding (sometime tomorrow, hopefully), I will try
> to work on that. I am open to any suggestions of what can be done. I
> have read about trying to copy the superblock from a good filesystem
> of the same size, but I don't know if I can achieve that without an
> empty 3TB of space. I will have to play with my other raid, but it
> has data on it, so I want to be careful.
Its possible that the resync that terminated did this. I do not know
the details of how CONFIG_LBD operates though. Mainly because I use
only 64 bit kernels on my 64 bit x86_64 capable machines (well since
2004) so there are only a few software raid machines left that are 32
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