Hi guys,
i have 4 debian squeeze with xen 4 and all them with 4 to 6
HVM virtual machines. All the VMs are located in a fith machine (A
SuperMicro LSI Controller as storage).
The host servers are Intel i7 with 24GB fo RAM (Debian Squeeze
+ Xen4) and the storage a Xen 3.0 with 8GB of RAM (CentOS 5.5 +
TGTD) and thery are all connect with a
gigabit network dedicated for the iSCSI.
My problem is, when working at the storage, doing backup
procedures with the command dd and using the bzip2, the IOWait
increases a litle bit, the normal state is close to 0%, but when
copying or moving the files generated by the backup, usually
bigger than 2G, the IOWait increases too much, reaching 100%, in
cases in all 4 cores, making the virtual machines stop responding
and even if i stop the procedure, the virtual machines doesnt
comes back, been necessary a reboot or shutdown.
Does anyone knows about this problem ? And there is any
configuration that i could do in the iSCSI-Target and Initiator to
increase de performance? And a configuration in the virtual
machines filesystem to prevent it from stopping?
Thanks you all,
Regards,
Tny M.
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