[Xen-users] xen disk io performance

[Alexandre Chapellon <a.chapellon@xxxxxxxxx>]

Hello,

I have a setup with several xen 3.2.1 dom0s (debian). Most of the VMs 
works nice but I have some load pick problem on some postgresql 
instances. PGSQL has been tuned quite nicely I guess, but during some 
jobs, IO load is very high and postgres seems really slow.
I am using FC LUNs fomr a NetApp SAN (with fast FC 15000t/m disks) and 
LVM as follow:
FC LUNs are in a volume group (I had new LUNs on the VG when mre space 
is needed) and VG is splited across several database servers (Xen 
guests) using LVs.
So my disk config for my VM look like this:

disk =[ 'phy:/dev/xendata/postgresql-syslog:xvdb1:w']

What can be done to improve disk IO and throuput?

--
<http://www.horoa.net>

Alexandre Chapellon

Ingénierie des systèmes open sources et réseaux.
Follow me on twitter: @alxgomz <http://www.twitter.com/alxgomz>


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