W.r.t hypervisor specific snapshots : - why is this snapshot required when a VM or its hypervisor supports quiesce operation. - what exactly happens during hypervisor snapshot ? Can this step be excluded.
On Wednesday, July 16, 2014, Mike Tutkowski <mike.tutkow...@solidfire.com> wrote: > This line at the bottom of my previous e-mail was redundant...I meant to > remove it before sending: > > A vendor snapshot can be created of the hypervisor snapshot file, then CS > can automatically delete > > > On Wed, Jul 16, 2014 at 8:10 AM, Mike Tutkowski < > mike.tutkow...@solidfire.com > <javascript:_e(%7B%7D,'cvml','mike.tutkow...@solidfire.com');>> wrote: > >> I believe this is what happens: >> >> * The VM gets quiesced. >> * Hypervisor snapshots are taken of all VM disks (so a new delta file >> shows up on each applicable SR). >> * The applicable storage plug-in can be invoked to take a >> vendor-specific snapshot of a given hypervisor snapshot delta file. >> * Once the storage plug-in is done, CS can delete the hypervisor snapshot >> delta file(s) that was/were created. >> >> A couple notes about this: >> >> * Since you are taking a vendor-side snap of a particular file, this >> relates to NFS. >> >> * I believe all disks of the VM need to be supported by the same storage >> vendor (i.e. if the root and data disks are on different SRs, each SR needs >> to be supported by the storage of the same backend vendor) >> >> A vendor snapshot can be created of the hypervisor snapshot file, then CS >> can automatically delete >> >> On Wednesday, July 16, 2014, Punith S <punit...@cloudbyte.com >> <javascript:_e(%7B%7D,'cvml','punit...@cloudbyte.com');>> wrote: >> >>> hi, >>> >>> while i was referring the ACS 4.3 doc for VM snapshot, >>> i see a feature Quiesce VM supported only by vmware hypervisor if the >>> cloudstack default primary storage is used, >>> but it also mentions that Quiesce VM can be supported if you are using a >>> third party primary storage plugin, the quiesce operation is provided by >>> plugin implementation! >>> >>> is Quiesce VM is a limitation of XEN hypervisor or is it not implemented >>> by xen agent in cloudstack ? >>> >>> how is third party primary storage plugin related to hypervisor feature ? >>> >>> -- >>> regards, >>> >>> punith s >>> cloudbyte.com >>> >> > > > -- > *Mike Tutkowski* > *Senior CloudStack Developer, SolidFire Inc.* > e: mike.tutkow...@solidfire.com > <javascript:_e(%7B%7D,'cvml','mike.tutkow...@solidfire.com');> > o: 303.746.7302 > Advancing the way the world uses the cloud > <http://solidfire.com/solution/overview/?video=play>*™* > -- Regards, Amit *CloudByte Inc.* <http://www.cloudbyte.com/>
