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Re: [Xen-users] Xen + Storage

To: "Oper.ML" <oper.ml@xxxxxxxxx>
Subject: Re: [Xen-users] Xen + Storage
From: Rudi Ahlers <Rudi@xxxxxxxxxxx>
Date: Wed, 14 Sep 2011 09:04:30 +0200
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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) a
nd 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.

 
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Kind Regards
Rudi Ahlers
SoftDux

Website: http://www.SoftDux.com
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