Re: megaraid_sas waiting for command and then offline

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David,

We switched to 2.6.18 (SMP) and applied the latest patches from LSI (got them directly from Sumant Patro). Also, he told me to make sure "read ahead" was set to "off". This seems to have reduced the frequency of the failures to about once per week (across 10+ machines), down from several times per week.

After I reported an additional failure, Sumant said they were able to reproduce the problems with XFS but they have not seen it with EXT3. I prefer XFS but I prefer to have reliable databases even more...

I now have a couple of systems running in the new configuration and I am slowly migrating others to it as well. I have not seen a failure with EXT3 but I statistically it would have been unlikely... I won't declare victory until I have more systems converted with a few weeks of reliable use.

Hope this helps... if anybody solves the root cause I will happily offer them a small gift to show my gratitude.

B-



David N. Welton wrote:

Hi,

I found someone corresponding to your name writing about a problem with
the megaraid sas driver/hardware on the LKML:

http://lkml.org/lkml/2006/9/6/12

We have a Dell (2950, running 2.6.18 #1 SMP) as well, and the way I
managed to kill the thing dead in its tracks (symptoms basically what
you you describe) is with smartctl:

root@salgari:~# smartctl --all /dev/sda
smartctl version 5.34 [i686-pc-linux-gnu] Copyright (C) 2002-5 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

Device: DELL     PERC 5/i         Version: 1.00
Device type: disk
Local Time is: Wed Oct 25 10:14:40 2006 CEST
Device does not support SMART

Error Counter logging not supported


Device does not support Self Test logging

----

[61101.681857] sd 0:2:0:0: rejecting I/O to offline device
[61101.681944] EXT3-fs error (device sda1): ext3_readdir: directory
#7553069 contains a hole at offset 0
[61103.944794] sd 0:2:0:0: rejecting I/O to offline device
[61103.944879] EXT3-fs error (device sda1): ext3_readdir: directory
#7553069 contains a hole at offset 0
[61104.672212] sd 0:2:0:0: rejecting I/O to offline device
[61104.672295] EXT3-fs error (device sda1): ext3_readdir: directory
#7553069 contains a hole at offset 0
[61105.255981] sd 0:2:0:0: rejecting I/O to offline device
[61105.256066] EXT3-fs error (device sda1): ext3_readdir: directory
#7553069 contains a hole at offset 0

----

Dead in the water.  We suspect that in any case there are some disk
problems, which is why we were trying to use smartctl in the first place.

I was just curious if you managed to figure anything out...

Thanks,
Dave Welton
-
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