Write-Back Caching

22 Dec: vMotion between hosts that are in two different datacenters

A stretched VMware cluster is configured across two different datacenters/sites connected over a WAN link, and VM vmotions can happen over the WAN link between hosts at these two site locations. If you are using ‘Write Back’ policy and if you want to support live VM vmotions between hosts across…

01 Nov: Write cache replication to protect against data loss in case of host failure

Write cache replication (mirroring) is only applicable to VirtuCache’s Write-Back caching policy (caches reads and writes). It doesn’t apply to VirtuCache’s Write-Through caching policy (caches only reads). Using the VirtuCache GUI, the administrator can assign Write-Back caching policy at the Datastore or VM level. There are 3 Write-Back caching policies…

15 Jun: Powershell scripts to move VMs to Write-Through before storage appliance snapshot starts and move VMs back to original caching policy after snapshot completes

Download the scripts from below link. Scripts that move VMs to Write-Through mode before controller snapshot is taken and revert VMs back to original caching policy after snapshot completes These scripts are only required if the below condition is true: [You use SAN controller snapshots to backup LUNs, without using any…

05 May: Veeam Instant Recovery Support

VirtuCache supports Veeam Instant Recovery only if the original VM is either not present or shutdown AND storage vmotion is used to promote the Instantly Recovered VM to production. Veeam prerequisites for Instant Recovery lists that the original VM should be shutdown: “If you restore a machine to the production…

09 Apr: VirtuCache interoperability with Veeam, Zerto, Commvault, Avamar, AppAssure. Nakivo, Actifio and Tivoli backup and replication software

Backup software vendors use a few different types of architectures and VMware APIs. Additional configuration might be required in VirtuCache to accelerate backups, taking care that the backup data doesn’t evict ‘hot’ VM production data and that backups are application-consistent even when VirtuCache is in Write-Back mode. Backup software using…