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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

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

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
hardware (and if hardware, any ideas how to figure out what is happening

on these 3 boxes)

David Lang

xfs mailing list

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