Re: Growing RAID10 with active XFS filesystem

[Wolfgang Denk <wd@denx.de>]

Dear Wol,

In message <5A538B30.4080601@youngman.org.uk> you wrote:
>
> You extend the filesystem *after* you've grown the array. The act of
> growing the array has caused the filesystem to crash. That should NOT
> happen - the act of growing the array should be *invisible* to the
> filesystem.

Not if this causes any hard I/O errors...

> In other words, one or more of the following three are true :-
> 1) The OP has been caught by some random act of God
> 2) There's a serious flaw in "mdadm --grow"
> 3) There's a serious flaw in xfs

The original log contained this:

| XFS (md5): metadata I/O error: block 0x12c08f360
| ("xfs_trans_read_buf_map") error 5 numblks 16
| XFS (md5): xfs_imap_to_bp: xfs_trans_read_buf() returned error 5.
| XFS (md5): metadata I/O error: block 0x12c08f360
| ("xfs_trans_read_buf_map") error 5 numblks 16
| XFS (md5): xfs_imap_to_bp: xfs_trans_read_buf() returned error 5.
| XFS (md5): metadata I/O error: block 0xebb62c00
| ("xfs_trans_read_buf_map") error 5 numblks 16
| XFS (md5): xfs_imap_to_bp: xfs_trans_read_buf() returned error 5.
| ...
| ... lots of the above messages deleted
| ...
| XFS (md5): xfs_do_force_shutdown(0x1) called from line 138 of file
| fs/xfs/xfs_bmap_util.c.  Return address = 0xffffffff8113908f
| XFS (md5): metadata I/O error: block 0x48c710b00 ("xlog_iodone") error 5
| numblks 64
| XFS (md5): xfs_do_force_shutdown(0x2) called from line 1170 of file
| fs/xfs/xfs_log.c.  Return address = 0xffffffff8117cdf4
| XFS (md5): Log I/O Error Detected.  Shutting down filesystem

To me this looks as if during the growing of the array some hard I/O
errors happenend.  That may have been triggered by the growing of
the array. but only as fas as it caused additional disk load /
reading of otherwise idle areas.

I cannot see any indications for 2) or 3) here, so yes, it was 1),
if you consider spurious I/O aerrors as such.

Or am I missing soething else?


Best regards,

Wolfgang Denk

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