From vlaero at yahoo.com.au Sat Sep 13 21:59:26 2014 Content-Type: multipart/mixed; boundary="===============1286449244754685061==" MIME-Version: 1.0 From: Paul Jansen To: users at ovirt.org Subject: [ovirt-users] [RFI] oVirt 3.6 Planning Date: Sat, 13 Sep 2014 18:59:24 -0700 Message-ID: <1410659964.78009.YahooMailNeo@web120602.mail.ne1.yahoo.com> --===============1286449244754685061== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable ---1212189890-1261065207-1410659964=3D:78009 Content-Type: text/plain; charset=3Dutf-8 Content-Transfer-Encoding: quoted-printable My vote is for storage load balancing/scheduler.=3D0AVmware's Vcenter has t= he=3D concept of a 'storage cluster'. It's essentially a logical storage devic= =3D e.=3D0AWhen you configure hosts/vms to use this device vcenter then works o= ut=3D which of the actual storage devices underneath this logical device is will= =3D send the storage requests to.=3D0AThis works out as a basic form of load b= al=3D acing by alternating where the storage for new vms are created.=3D0AThis is= n'=3D t particularly amazing, but what it does allow - with the highest end vcent= =3D er licensing anyway - is what Vmware calls 'storage distributed resource sc= =3D heduling'.=3D0AMuch like we already have the ability to have a scheduler th= at=3D moves the execution of vms around on hosts based on load, this does the sa= =3D me thing for the storage component of VM.=3D0AImagine having two configured= s=3D torage locations under a 'storage cluster' and then having the ability to p= =3D ut one of the storage locations into 'maintenance mode'. The storage sched= =3D uler would then 'live storage migrate' all the storage for vms over to the = =3D other storage location. This would then allow the first storage location t= =3D o be taken down for maintenance.=3D0AThis approach also allows storage to s= ca=3D le over time as more is added. The 'storage scheduler' can take inputs suc= =3D h as latency etc into account and manage the load across the 'storage clust= =3D er' to balance things out and make smart decisions so that the avaialble st= =3D orage is utilized as best as it can be (ie: not overloading one storage loc= =3D ation while the other location is mainly idle).=3D0A=3D0A=3D0AI've done a b= it a s=3D earching to see where Ovirt might be up to in this regard and what I've fou= =3D nd seems to indicate that we are not anywhere near this capability just yet= =3D .=3D0AAn important prerequisite is having the hosts able to actually do a l= iv=3D e storage migration. EL7 based hosts under ovirt 3.5 have this, as have Fe= =3D dora 19 and 20 hosts.=3D0AIf the decision is made to use qemu-kvm-rhev on E= L6=3D hosts - as has been talked about recently - then the host requirement for = =3D supporting live storage migration will be met. This then allows the idea o= =3D f a storage scheduler to be futher considered.=3D0A=3D0AI think this is an = impo=3D rtant step in reaching feature parity with Vmware's vcenter product, and re= =3D moves a key reason ovirt/rhev can't be considered in some instances.=3D0A ---1212189890-1261065207-1410659964=3D:78009 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: quoted-printable

My vote is for storage load balancing/scheduler.

Vmware's Vcenter has the concept of a 'storage cluster'. It'= =3D s essentially a logical storage device.

When you configure hosts/= =3D vms to use this device vcenter then works out which of the actual storage d= =3D evices underneath this logical device is will send the storage requests to.= =3D

This works out as a basic form of load balacing by alternating w= =3D here the storage for new vms are created.

This isn't particularly= =3D amazing, but what it does allow - with the highest end vcenter licensing a= =3D nyway - is what Vmware calls 'storage distributed resource scheduling'.

Much like we already have the ability to have a scheduler that moves= =3D the execution of vms around on hosts based on load, this does the same thing for the storage component of VM.

Imagine having two c= =3D onfigured storage locations under a 'storage cluster' and then having the a= =3D bility to put one of the storage locations into 'maintenance mode'. T= =3D he storage scheduler would then 'live storage migrate' all the storage for = =3D vms over to the other storage location. This would then allow the fir= =3D st storage location to be taken down for maintenance.

This approa= =3D ch also allows storage to scale over time as more is added. The 'stor= =3D age scheduler' can take inputs such as latency etc into account and manage = =3D the load across the 'storage cluster' to balance things out and make smart = =3D decisions so that the avaialble storage is utilized as best as it can be (i= =3D e: not overloading one storage location while the other location is mainly = =3D idle).

I've done a= =3D bit a searching to see where Ovirt might be up to in this regard and what = =3D I've found seems to indicate that we are not anywhere near this capability = =3D just yet.

An import= =3D ant prerequisite is having the hosts able to actually do a live storage mig= =3D ration. EL7 based hosts under ovirt 3.5 have this, as have Fedora 19 = =3D and 20 hosts.

If the decision is made to use qemu-kvm-rhev on EL6 hosts - as has been = =3D talked about recently - then the host requirement for supporting live stora= =3D ge migration will be met. This then allows the idea of a storage sche= =3D duler to be futher considered.

I = =3D think this is an important step in reaching feature parity with Vmware's vc= =3D enter product, and removes a key reason ovirt/rhev can't be considered in s= =3D ome instances.

<= =3D br>

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