![]() ![]() VMWare has a concept of virtual datastore that is similar to an SR in XenServer. Various storage vendors plug into the data layer via an API provided by VMWare (VASA API). The control plane is responsible for all the logic that happens, for example which VM gets what volumes, access control, QoS limits, snapshots, replication, deduplication. VVOLs divides the storage management into a control plane and a data plane. It is similar to a component once provided by XenServer called StorageLink. VVOLs enable the integration of external storage (SAN/NAS) with VMware’s storage management layer. It may be useful to compare and contrast this work to Virtual Volumes (VVOLs), which is VMWare’s offering for enabling VDI-per-LUN to our supplemental pack for XenServer. By limiting to a single VDI in a LUN, we can also enable QoS per volume (if the storage supports it, which SolidFire does). This gives the ability to use much more efficient backend snapshots instead of XenServer snapshots, which are relatively slow and have an impact on guest VM performance. This is done by “resignaturing” the SR metadata so that there are no conflicts during reattachment. ![]() This supplemental pack enables the ability to reattach LUNs created by taking snapshots of ISCSI SRs on backends like SolidFire or Equallogic. Citrix will continue to offer commercial support for XenServer with the supplemental pack installed, though it will not support the supplemental pack itself. The supplemental pack is available on GitHub here and is verified as “Citrix Ready”. XenServer With Pack Remains Supported by Citrix Furthermore, this work allows more seamless migration of volumes between virtualized clusters, and allows fine grained QoS to be applied per volume in a multi-tenant environment. This allows more efficient support of processes that rely on snapshots including backups of XenServer virtual machines by leveraging integrated snapshots on a SAN, in this case SolidFire which is a popular scale-out iSCSI block storage for cloud infrastructure. ![]() Syed Ahmed of CloudOps has completed an open source project to allow XenServer 6.5 to leverage backend SAN snapshots byresignaturing metadata of a copied LUN (Logical Unit Number). Supplemental Pack for XenServer 6.5 Allows VVOLs-like VDI per LUN Functionality for XenServer and Enables Multi-tenant QoS ![]()
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