On Wed, 2007-02-14 at 17:20 +0100, Simons IT-Service wrote:
> Hello,
>
> I have a server with 4GB of Memory, two Intel QuadCore Xeon CPUs and a LSI
> FibreChannel 4GBit HBA Card connected to a SAN-Box.
>
> When I install this with a normal Linux (CentOS 4.4) with kernel
> 2.6.9-42.0.3.ELsmp and the mptfc driver, which is deliverd with this kernel,
> everything works fine.
>
> I can copy a 600 MB file from one directory to an other on the same partition
> in 6 seconds.
>
> When I install on the same server a Xen-kernel (2.6.16.29-xen) with the mptfc
> driver, which is deliverd with this kernel, the I/O performance to the SAN is
> very,very,very slow.
>
> When I copy in a domU a 600 MB file from one directory to an other on the
> same partition it take 90 seconds.
>
> The config file for the disk in my domU is this:
>
> disk = [ 'phy:/dev/OracleVG/OraAdmin10gR2,/dev/sda1,w',
> 'phy:/dev/OracleVG/OraDumps10gR2,/dev/sda2,w',
> 'phy:/dev/OracleVG/OraProduct10gR2,/dev/sda3,w',
> 'phy:/dev/OracleVG/OraSoftware10gR2,/dev/sda4,w',
> 'phy:/dev/OraDataVG/pdevkh1,/dev/sdb1,w',
> 'phy:/dev/OraDataVG/pskh,/dev/sdb2,w', 'phy:/dev/OraDataVG/temp,/dev/sdb3,w',
> 'phy:/dev/sda13,/dev/sdc1,w' ]
>
I'm not 100% sure its going to *significantly* improve things, but
giving the dom-u some swap space may help, unless this one :
'phy:/dev/sda13,/dev/sdc1,w'
is handling swap locally, but it looks like it may be the boot vbd,
unless sda1 also contains the root filesystem for the guest?
Best,
--Tim
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