Re: [Xen-users] disk image corruption

["Eljas Alakulppi" <Buzer@xxxxxxxxx>]

On Sat, 30 May 2009 00:37:36 +0300, Justin Tianen <jtianen@xxxxxxxxxx>  
wrote:
> My problem is that 2 of my 3 machines will, at random, remount their  
> root partition as read-only. I am able to console in and reboot the  
> machine. On boot, the machine requires a manual fsck. After the fsck  
> completes, I reboot and the vm is fine for a few days. Then, randomly  
> again, the drive remounts read-only. This happens on the 2nd and 3rd  
> machine I created in dom0. The 1st machine has been fine since install.
Have you checked the dmesg for additional details when it happens? I have  
seen similar thing before (not with Xen tho) and the cause was read/write  
timeout due to too high I/O usage since multiple backups were running at  
the same time and the backend storage couldn't handle it fast enough.
So if you already didn't, you should set the rsync jobs to perform at  
different times (also check when some other I/O intensive tasks like  
updatedb are ran and plan the times so they at least try to avoid running  
at the same time). You could also try to incrase the timeout values.
-Eljas

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