Re: [Xen-users] Shared SAN disk LUN between 2 servers and migrationproblem

[Peter Van Biesen <peter.vanbiesen@xxxxxxx>]

Hi,

I'm running a xen cluster with paravirtualised windows xp machines. The domu 
disks are LUN's ( no clvm or such ). They are shared between the cluster 
members ( dom0 ). The HBA cards are qlogics, the diskarray an hp xp 128. Xen 
version is 3.2-1, dom0 kernel is 2.6.18 from debian stable. The multipath 
daemon is running.

Live migration works perfectly for non-hvm domu's. Windows domu's, however, do 
not live migrate in this setup ( I don't know why ). Gplpv drivers corrupt the 
fs upon shutdown of the domu ( as long as it is kept running, I haven't noticed 
corruption ). So basically, as long as you keep your windows hvm domu running 
with the block device it started with, you're ok. Switch ( either from VBD to 
ioemu either from machine - live migrate ) and you're in trouble. 

FYI

Peter.

On Tuesday 21 October 2008 10:07:18 Pekka.Panula@xxxxxxxx wrote:
> xen-users-bounces@xxxxxxxxxxxxxxxxxxx wrote on 20.10.2008 20:37:57:
> 
> I tested also with paravirtualized CentOS 5.2 32-bit and i did not got any 
> corruption during 7-zip or with zip. I did migrate atleast 4 times during 
> compression and then i did verify compressed file and they all say it was 
> ok.
> 
> I did get corrupted with Windows 2003 standard server, with HVM drivers 
> and with GPLPV drivers. Compression program was 7-zip latest beta i think, 
> maybe 7-zip does not like virtualized servers. 
> 
> Storage is IBM DS-series and Xen servers are on BladeCenter H HS21 cards, 
> so HBA is "QLogic Corp. ISP2422-based 4Gb Fibre Channel to PCI-X HBA (rev 
> 02)", driver: 8.02.00-k5-rhel5.2-04
> 
> Anyone else running Xen with similar system and does your HVM Windows DomU 
> migrate without filesystem corruptions?
> 
> BTW: I did test also Xen 3.3.0 but interestingly you cant migrate it with 
> 3.2.1 Xen, is this bug or should it work? 
> 
> Terveisin/Regards,
>    Pekka Panula, Net Servant Oy
> 



-- 
Peter Van Biesen
Sysadmin VAPH

tel: +32 (0) 2 225 85 70
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e-mail: peter.vanbiesen@xxxxxxx
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