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RE: need troubleshooting help to track down a xfsdatad or hardware probl

To: "Neff, Bryan" <BNeff@xxxxxxxxx>
Subject: RE: need troubleshooting help to track down a xfsdatad or hardware problem
From: david@xxxxxxx
Date: Fri, 31 Jul 2009 15:20:12 -0700 (PDT)
Cc: xfs@xxxxxxxxxxx
In-reply-to: <46F2C60C4F4D4F4687C6DFCE5DC4630D01CF579A@xxxxxxxxxxxxxxxxxx>
References: <alpine.DEB.1.10.0907311433270.28013@xxxxxxxxxxxxxx> <46F2C60C4F4D4F4687C6DFCE5DC4630D01CF579A@xxxxxxxxxxxxxxxxxx>
User-agent: Alpine 1.10 (DEB 962 2008-03-14)
On Fri, 31 Jul 2009, Neff, Bryan wrote:

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.

thanks, the $#%@#$ vendor shipped all 20 systems without battery backup, and apparently couldn't even configure them consistantly.

David Lang

-----Original Message-----
From: xfs-bounces@xxxxxxxxxxx [mailto:xfs-bounces@xxxxxxxxxxx] On Behalf
Of david@xxxxxxx
Sent: Friday, July 31, 2009 2:37 PM
To: xfs@xxxxxxxxxxx
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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