Re: [Xen-users] Setting up XEN domU causes RAID5 to fail?

[Tony Lill <ajlill@xxxxxxxxxxxxxxxxxxx>]

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When I tried to upgrade my xen systems to a pvops xen/linux combo, I
found that high disk I/O would cause disk errors and caused disks to
be thrown out of the raid and all sorts of other badness. High of
course, is a relative term. For one of my boxes, copying a large file
was enough, on another, it needed something like running backups on
several VMs simultaneously or trying to start my VM's while rebuilding
the raid.

FWIW, I went back to Xen 3.4.4 and the SLES1 xenlinux kernel and
they've been rock solid.

On 09/16/2012 09:52 PM, Marc Tousignant wrote:
> No messages in dmesg or on the console, though to be fair, the
> root partition is "broken" at that point and can't write to any
> files. I just tested again to be sure, this time I cant even cat
> the logs.
> 
> -----Original Message----- From: xen-users-bounces@xxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxx] On Behalf Of Tony Lill 
> Sent: Sunday, September 16, 2012 7:27 PM To: 
> xen-users@xxxxxxxxxxxxx Subject: Re: [Xen-users] Setting up XEN 
> domU causes RAID5 to fail?
> 
> Are there any messages in the kernel log or dmesg regarding these 
> disks?
> 
> On 09/16/2012 04:06 PM, Marc Tousignant wrote:
>> FYI, I switched to file: and still the same issue occurred, with 
>> one exception.. This time it "lost" the RAID members while 
>> booting off the ISO. I hadn't even gotten to the install screens 
>> yet.
> 
>> -----Original Message----- From: Ian Campbell 
>> [mailto:Ian.Campbell@xxxxxxxxxx] Sent: Sunday, September 16, 2012
>> 2:08 PM To: Marc Tousignant Cc: xen-users@xxxxxxxxxxxxx Subject:
>> Re: [Xen-users] Setting up XEN domU causes RAID5 to fail?
> 
>> On Sun, 2012-09-16 at 18:28 +0100, Marc Tousignant wrote:
> 
>>> I then created several .img files in the xen_images folder 
>>> using dd. For example (dd if=/dev/zero 
>>> of=/images/xen_images/Win7x86_Base.img bs=1 count=1 seek=50G)
>> [...]
>>> I got to the point where it formatted the “drive” and started 
>>> installing, it failed on the extraction step saying my “DVD” 
>>> was bad.
> 
>> What does your guest config file look like, in particular the 
>> disk line.
> 
>> Is there any chance that you have accidentally pointed the VM's 
>> disks at one or more of the physical disks which makes up your 
>> RAID array?
> 
>> Ian.
> 
> 
> 
>> _______________________________________________ Xen-users
>> mailing list Xen-users@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-users
> 
> 
> 
> _______________________________________________ Xen-users mailing 
> list Xen-users@xxxxxxxxxxxxx http://lists.xen.org/xen-users
> 
> 
> _______________________________________________ Xen-users mailing 
> list Xen-users@xxxxxxxxxxxxx http://lists.xen.org/xen-users
> 

- -- 
Tony Lill, OCT,                    Tony.Lill@xxxxxxxxxxxxxxxxxxx
President, A. J. Lill Consultants                 (519) 650 0660
539 Grand Valley Dr., Cambridge, Ont. N3H 2S2     (519) 241 2461
- --------------- http://www.ajlc.waterloo.on.ca/ ----------------


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