Hi Rudy
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.
Regards,
Tony M.
On 09/14/2011 04:04 AM, Rudi Ahlers wrote:
On Tue, Sep 13, 2011 at 2:11 AM, Oper.ML
<oper.ml@xxxxxxxxx>
wrote:
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.
_______________________________________________
What is the specs of your storage server?
It sounds like the storage server is underpowered or
overloaded quite a lot.
Kind Regards
Rudi Ahlers
SoftDux
Website: http://www.SoftDux.com
Technical Blog: http://Blog.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532
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