Re: [Xen-devel] Xen 3.0.3 tap:aio disk image fails on RAID5/XFS filesystem

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Apr 27, 2010 at 05:19:54PM +1000, Steven Haigh wrote:
> 
> On Tue, 27 Apr 2010 14:01:17 +1000, Steven Haigh <netwiz@xxxxxxxxx> wrote:
> > Hi all,
> > 
> > Upon bashing my head against a wall trying to get Xen working on my new
> > hardware I came across an interesting discovery. Every install using
> > virt-install was failing and I could only use the file: access method
> for
> > my DomUs. Every time I tries to use tap:aio the guest would error on
> boot
> > saying it couldn't find the root partition.
> > 
> > My system is as follows:
> > OS: CentOS 5.4
> > Xen: 3.0.3-94.el5_4.3
> > / = 2 x 80Gb HDDs, dmraid1, ext3
> > /mnt/raid = 3 x 1Tb HDDs, dmraid5, xfs
> > 
> > On whim, I moved the DomU images from /mnt/raid/vm-images to /vm-images
> > and instantly tap:aio worked again.
> > 
> > This brings me to my question:
> > 
> > Why would tap:aio fail when the images are on an XFS/RAID5 filesystem
> but
> > work correctly when on a RAID1/ext3 filesystem?
> > 
> > To me, this seems like a bug.
> 
> Oh, and for the record, this is my config file:
> 
> name = "mail.crc.id.au"
> uuid = "929c5a29-10c2-b388-ff01-42110c4ea66e"
> maxmem = 512
> memory = 512
> vcpus = 2
> bootloader = "/usr/bin/pygrub"
> on_poweroff = "destroy"
> on_reboot = "restart"
> on_crash = "restart"
> #disk = [ "file:/vm-images/mail.crc.id.au.img,xvda,w" ]
> disk = [ "tap:aio:/vm-images/mail.crc.id.au.img,xvda,w" ]
> vif = [ "mac=00:16:3E:00:00:13, bridge=virbr0" ]
> 

Since you're using EL5 distribution you might want to search Redhat bugzilla
to see if there are already existing bugreports about this issue.

-- Pasi


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