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Re: [xen-br] Re: [Xen-users] Xen + Storage

Hi Tony

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  .

On Wed, Sep 14, 2011 at 2:59 PM, Oper.ML <oper.ml@xxxxxxxxx> wrote:
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.

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) 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,
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

Website: http://www.SoftDux.com
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LPIC-2 / MCSA-Windows 2003 / CompTIA Security+

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