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but the storage aint Intel i7, it is a Xeon processor, just
the Xen Host are Intel i7.
On 09/16/2011 01:15 PM, Bruno Steven wrote:
I had this same problem a one year ago. My host have one
processor Icore7 and motherboard Asus , I don´t remember the name.
I did same process like you , backup using DD before I make a
copy img for other machine using cp for external volume NFS. The
host any time freeze . I belive the problem is raid controller of
motheboard because my stuff team change SO this host for Windows
2008 still problem . Windows Server 2008 and Linux aren´t
compatible with this motherboard. Til today I don´t found any
motheboard for Icore7 100% compatible for Linux so for use XEN
production enviroment I use IBM XEON or processor XEON with
motherboard INTEL for server, never motheboard Desktop .
the storage serer is a Xeon Quad 2.13GHz (E5506) with
8GB DDR3 of RAM, a SuperMicro motherboard (X8ST3) and a
LSI Logic SAS Controller (MegaRAID SAS 1078), it also has
16 hard disks in RAID50 and now is sharing with iSCSI 44
LVM partitions under the CentOS 5.5 S.O.
Most of the time, the system shows 100% idle for all
cores, the load avarage is 0.09 0.04 0.00 and used 1.3GB
of RAM with 772MB buffer, 160MB cache.
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
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
Thanks you all,
What is the specs of your storage server?
It sounds like the storage server is underpowered
or overloaded quite a lot.