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' ]
The filesystem is ext3.
You can see that we would run Oracle 10g R2 in a Xen DomU.
We work with datafiles greater then 6GB.
Copy from a partiton to an other is ok.
Can anybody help us?
greetz from Krefeld,
Germany
Dietmar Simons
--
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Simons IT-Service
Dietmar Simons
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41468 Neuss
Germany
Phone: 02131 - 153498
Fax: 02131 - 153499
Mobil: 0172 - 253 0523
email: info@xxxxxxxxxxxxxxxxxxxx
http://www.simons-it-service.de
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