[Xen-users] Correct disk configurations

Geoff Galitz
2010-08-24T06:09:49Z

Hello.

We are having occasional issus with disk IO in our Xen guests.  The wait IO can
get very high (sometimes even 100%).  The disk are NFS mounted from an Isilon
cluster.  I believe our Xen guests are not fully tuned.

Basically my question is: For a Centos 5.x Xen DomU, what disk device drivers
should I have loaded and is there anything else in particular I should pay
attention to?

xm info output:

release                : 2.6.18-194.3.1.el5xen
version                : #1 SMP Thu May 13 13:49:53 EDT 2010
machine                : x86_64
nr_cpus                : 16
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 2
cpu_mhz                : 2261
hw_caps                :
bfebfbff:28100800:00000000:00000340:009ce3bd:00000000:00000001:00000000
virt_caps              : hvm
total_memory           : 32758
free_memory            : 12166
node_to_cpu            : node0:0-15
node_to_memory         : node0:12166
xen_major              : 3
xen_minor              : 4
xen_extra              : .2
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
cc_compiler            : gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)
cc_compile_by          : root
cc_compile_domain      : gitco.tld
cc_compile_date        : Wed Nov 11 21:16:28 CET 2009
xend_config_format     : 4





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