From vlaero at yahoo.com.au Thu Nov 13 06:09:11 2014 Content-Type: multipart/mixed; boundary="===============5083980448000015942==" MIME-Version: 1.0 From: Paul Jansen To: users at ovirt.org Subject: [ovirt-users] storage offload capability Date: Thu, 13 Nov 2014 03:09:10 -0800 Message-ID: <1415876950.78136.YahooMailNeo@web160304.mail.bf1.yahoo.com> --===============5083980448000015942== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable ---1603101515-1922022095-1415876950=3D:78136 Content-Type: text/plain; charset=3Dutf-8 Content-Transfer-Encoding: quoted-printable I have an ovirt 3.5 cluster set up with three el7 hosts. Storage is provid= =3D ed by two Fedora 20 machines and the connection is via multipath iscsi.=3D0= AT=3D he performance is quite good. The Fedora 20 iscsi targets are using the 't= =3D arget' (ie: lio) framework, which support the various t.10 scsi offloads. = =3D Vmware supports a subset of these called VAAI and Microsoft has a subset ca= =3D lled ODX.=3D0ACloning is one if the t.10 extensions that the lio target fra= me=3D work supports.=3D0A=3D0AI just tried cloning a vm and noticed that during t= he p=3D rocess there is a lof of traffic over the iscsi interfaces on the Storage P= =3D ool Manager host and the iscsi target machine.=3D0AWith proper support for = t.=3D 10 cloning I shoudn't see any traffic on the isci links (or very minimal tr= =3D affic)=3D0A=3D0AIs there some way to enable the storage offload functionali= ty i=3D n Ovirt?=3D0AIf not, is this on the VDSM roadmap? If support were worked i= n =3D this should be able to be applied to FCP connections as well. The lio targ= =3D et supports these offloads when acting as a Fiber Channel target also.=3D0A= =3D =3D0A=3D0AI've asked this sometime back but there hasn't been much in the w= ay o=3D f discussion on this users list or the devel list about this feature. ---1603101515-1922022095-1415876950=3D:78136 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: quoted-printable

I have an ovirt 3.5 cluster set up with three el7 hosts.= =3D Storage is provided by two Fedora 20 machines and the connection is = =3D via multipath iscsi.

The performance is quite good. The Fed= =3D ora 20 iscsi targets are using the 'target' (ie: lio) framework, which supp= =3D ort the various t.10 scsi offloads. Vmware supports a subset of these= =3D called VAAI and Microsoft has a subset called ODX.

Cloning is on= =3D e if the t.10 extensions that the lio target framework supports.

<= =3D div>I just tried cloning a vm and noticed that during the process there is = =3D a lof of traffic over the iscsi interfaces on the Storage Pool Manager host= =3D and the iscsi target machine.

With proper support for t.10 cloni= =3D ng I shoudn't see any traffic on the isci links (or very minimal traffic)

Is there some way = =3D to enable the storage offload functionality in Ovirt?

If not, is this on the VDSM roadmap? If support= =3D were worked in this should be able to be applied to FCP connections as wel= =3D l. The lio target supports these offloads when acting as a Fiber Chan= =3D nel target also.

<= =3D div style=3D3D"color: rgb(0, 0, 0); font-size: 12px; font-family: HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; bac= =3D kground-color: transparent; font-style: normal;">I've asked this sometime b= =3D ack but there hasn't been much in the way of discussion on this users list = =3D or the devel list about this feature.

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