Might just be a coincidence, but on yesterday my development server lost
all multipath connections to its EMC AX Array during it's weekly full
backup. The dm_emc module was not able to revive any of the 4 paths --
which were in fact all fine. I had to unload / reload all dm-modules to
get the volume back online.
This has never happened before and the server is already running 5.1.
regards, Gunther
Tom Sightler wrote:
On Sat, 2007-11-17 at 19:42 -0500, Tom Sightler wrote:
Running this command on RHEL5.1 consistently produces errors on the
filesystem with messages like the following:
EXT3-fs error (device dm-19) in ext3_orphan_del: Journal has aborted
EXT3-fs error (device dm-19) in ext3_reserve_inode_write: Journal has
aborted
__journal_remove_journal_head: freeing b_committed_data
__journal_remove_journal_head: freeing b_committed_data
attempt to access beyond end of device
dm-19: rw=0, want=17247241224, limit=4688363520
attempt to access beyond end of device
If we reboot the very same hardware with RHEL4.5, mount the same volume,
and run the same test it works perfectly every time.
Has anyone else run significant I/O stress test on RHEL5.1 yet? We have
not been able to reproduce this issue with non-striped volumes but we're
still very early in our testing and are just looking for community
feedback before taking up the problem with Redhat.
I know it's poor form to reply to myself but looking deeper into the
test results it seems the corruption is only happening when the
underlying physical volumes are using dm-multipath with round-robin load
balancing, and perhaps only with certain hardware. We can easily
reproduce the issue with a simple partition over a single dm-multipath
device to a LUN on an Apple Xserve RAID.
This still seems like it's probably a bug since the exact same config
works flawlessly with RHEL4.5 and hardware works fine with round-robin.
Changing the policy to "failover" rather than "multibus" seems to work
around the problem since that makes only one path active. We'll do more
testing with a wider array of storage next week but I'd still love to
hear from others that might be running dm-multipath with round-robin
load balancing if their seeing any issues with 5.1.
Thanks,
Tom
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