Re: [Xen-API] xcp 1.1, linux 3.2 domu , and barrier issue, patch for blkback needed in dom0 kernel

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, May 30, 2012 at 09:22:00AM +0200, Denis Cardon wrote:
> Hi all,
> 
> >>We use barrier=0 for Ubuntu 12.04 for the last few weeks and haven't seen 
> >>an issue with it. Other than the ability to reboot and have the system come 
> >>up reliably.
> >
> >Yes, but obviously the issue should be fixed in XCP dom0 kernel instead, so 
> >you don't need any workaround in the VMs.
> 
> thanks for your answer.
> 

Jeremy's xen.git has the patch for pvops 2.6.32 dom0, I think it was called:
"xen: blkback: don't fail empty barrier requests".

SUSE's sles11sp1 kernel probably has the patch for the xenlinux 2.6.32 dom0 
kernel,
so it could be grabbed for XCP from there.

Any XenServer/XCP dom0 kernel guys here on the list? 

-- Pasi


> Cheers, keep on the good work!
> 
> Denis
> 
> 
> >
> >-- Pasi
> >
> >>
> >>-----Original Message-----
> >>From: xen-api-bounces@xxxxxxxxxxxxx [mailto:xen-api-bounces@xxxxxxxxxxxxx] 
> >>On Behalf Of Denis Cardon
> >>Sent: Tuesday, May 29, 2012 4:52 AM
> >>To: xen-api@xxxxxxxxxxxxx
> >>Subject: [Xen-API] xcp 1.1, linux 3.2 domu , and barrier issue
> >>
> >>Hi everyone,
> >>
> >>Debian Wheezy PV guest (linux kernel 3.2) currently has some issues with 
> >>barrier where the guest boots with read only disk.
> >>
> >>There has been some hint to disable barrier (adding barrier=0 in fstab), 
> >>and it seems to indeed resolve the issue, cf links below.
> >>
> >>http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=637234
> >>http://www.warden.pl/2012/04/10/debian-io-disk-problem-when-rebooting-on-xenserver-guest/
> >>
> >>I wanted to know if there are any side effect to that workaround or if it 
> >>is safe?
> >>
> >>Cheers,
> >>
> >>Denis
> >>
> >>
> >>--
> >>Denis Cardon
> >>Tranquil IT Systems
> >>44 bvd des pas enchantés
> >>44230 Saint Sébastien sur Loire
> >>tel : +33 (0) 2.40.97.57.57
> >>http://www.tranquil-it-systems.fr
> >>
> >>
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> >>
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> 
> 
> -- 
> Denis Cardon
> Tranquil IT Systems
> 44 bvd des pas enchantés
> 44230 Saint Sébastien sur Loire
> tel : +33 (0) 2.40.97.57.57
> http://www.tranquil-it-systems.fr
> 

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