Misaligned Disk after resize
Hi guys, We re-sized (expanded) a Server 2003 VM a few weeks back and since then the CPU load seems to be rather excessive. Also in the oVirt GUI it reports the disk is misaligned, I've done a bit of reading and it sounds like the only way to correct the alignment again is to re-install, is this the only option? Thank you. Regards. Neil Wilson.
--=-FecfxbSE6ELSYP2S1LHB Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Neil, To severely impact iops with a single nonaligned VM - image the is rather unusual. Can you please be more specific: IIRC, to run into the misalignment scenario you need block backed storage for your VM. So FC / Posix / iSCSI but not NFS. - The CPU load of the visualization host or the VM? - Can you confirm (eg. with top) that you have constant a high IO Wait (>20%) there? Cheers,=20 On Di, 2014-07-22 at 14:47 +0200, Neil wrote:
Hi guys, =20 We re-sized (expanded) a Server 2003 VM a few weeks back and since then the CPU load seems to be rather excessive. Also in the oVirt GUI it reports the disk is misaligned, I've done a bit of reading and it sounds like the only way to correct the alignment again is to re-install, is this the only option? =20 Thank you. =20 Regards. =20 Neil Wilson. _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
--=20 Daniel Helgenberger=20 m box bewegtbild GmbH=20 P: +49/30/2408781-22 F: +49/30/2408781-10 ACKERSTR. 19=20 D-10115 BERLIN=20 www.m-box.de www.monkeymen.tv=20 Gesch=C3=A4ftsf=C3=BChrer: Martin Retschitzegger / Michaela G=C3=B6llner Handeslregister: Amtsgericht Charlottenburg / HRB 112767=20 --=-FecfxbSE6ELSYP2S1LHB Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIN9zCCBFcw ggM/oAMCAQICCwQAAAAAAS9O4TFGMA0GCSqGSIb3DQEBBQUAMFcxCzAJBgNVBAYTAkJFMRkwFwYD VQQKExBHbG9iYWxTaWduIG52LXNhMRAwDgYDVQQLEwdSb290IENBMRswGQYDVQQDExJHbG9iYWxT aWduIFJvb3QgQ0EwHhcNMTEwNDEzMTAwMDAwWhcNMTkwNDEzMTAwMDAwWjBUMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEqMCgGA1UEAxMhR2xvYmFsU2lnbiBQZXJzb25h bFNpZ24gMiBDQSAtIEcyMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwWtB+TXs+BJ9 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Hi Daniel, Correct, we are using FC as primary storage. The VM itself was a Server 2003 VM, so the only resources we could get were from the task manager, the CPU resources in Task Manager showed the load spiking to 100% usage. The backup VM (prior to extending) is currently being restored from the export domain and the extended VM is shutdown currently, so I won't be able to give you the info until I boot it up again. My apologies, another technician is actually working on this problem and he's just gone ahead trying to restore. Thanks for coming back to me though. Much appreciated. Regards. Neil Wilson. On Tue, Jul 22, 2014 at 3:27 PM, Daniel Helgenberger <daniel.helgenberger@m-box.de> wrote:
Hi Neil,
To severely impact iops with a single nonaligned VM - image the is rather unusual.
Can you please be more specific: IIRC, to run into the misalignment scenario you need block backed storage for your VM. So FC / Posix / iSCSI but not NFS. - The CPU load of the visualization host or the VM? - Can you confirm (eg. with top) that you have constant a high IO Wait (>20%) there?
Cheers,
On Di, 2014-07-22 at 14:47 +0200, Neil wrote:
Hi guys,
We re-sized (expanded) a Server 2003 VM a few weeks back and since then the CPU load seems to be rather excessive. Also in the oVirt GUI it reports the disk is misaligned, I've done a bit of reading and it sounds like the only way to correct the alignment again is to re-install, is this the only option?
Thank you.
Regards.
Neil Wilson. _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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