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[dm-devel] Buffer I/O error



Hi dm-devel,

I'm running into an issue with dm-multipath (device-mapper-multipath-0.4.5-27.el4_6.3) that has me confused and I was hoping I could get some guidance.

Here are the relevant dmesg messages:
device-mapper: dm-multipath: Failing path 8:48.
device-mapper: dm-multipath: Failing path 8:48.
device-mapper: dm-multipath: Failing path 8:48.
device-mapper: dm-multipath: Failing path 65:80.
printk: 1004 messages suppressed.
Buffer I/O error on device dm-13, logical block 1192525829
lost page write due to I/O error on dm-13

Normally when I have seen Buffer I/O errors in the past, they have been accompanied by SCSI errors as well, but in this case I am not getting anything. One odd thing is that the filesystem reported extremely slow writes before the buffer I/O errors occurred. I have checked and double-checked the storage array and everything seems fine. I am using directio as my path checker if that makes a difference.

I have been able to reproduce the problem consistently by attempting an fsck on dm-13. However, I am now doing an fsck on the underlying sd device and it hasn't bombed out yet with the buffer I/O errors.

Has anyone encountered these seemingly inexplicable buffer I/O errors before? Any advice on how to debug it?

Thanks,
Kit Westneat


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