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

[Steven Haigh <netwiz@xxxxxxxxx>]

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" ]

-- 
Steven Haigh
 
Email: netwiz@xxxxxxxxx
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299

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