need troubleshooting help to track down a xfsdatad or hardware problem

[Neff, Bryan]

This is an issue with your controller disabling write cache - not an XFS
issue.

If your 3Ware Battery Backup Unit is not working, or is not sufficiently
charged, the controller will disable drive write cache.
Also, if your array is in a degraded state, the controller will disable
write cache.
You can change this behavior by changing the storsave policy.  

-----Original Message-----
From: xfs-bounces at oss.sgi.com [mailto:xfs-bounces at oss.sgi.com] On Behalf
Of david at lang.hm
Sent: Friday, July 31, 2009 2:37 PM
To: xfs at oss.sgi.com
Subject: need troubleshooting help to track down a xfsdatad or hardware
problem

I have 20 identical boxes that have a 16 drive raid 6 array (3ware 
controller), on 17 of the boxes everything seems fine, but on 3 of the 
boxes the xfsdatad process appears to be having problems writing to the 
drive (iostat shows 5MB throughput), and a huge amount of data ends up 
buffered in memory, but cannot get written out to the disk.

what can I do to figure out if the problem is somewhere in software or
in 
hardware (and if hardware, any ideas how to figure out what is happening

on these 3 boxes)

David Lang

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