All ESXi versions

10 May: Why are my backup times not improving with VirtuCache?

All the below configurations needs to be applied to VirtuCache and your backup software for VM backup times to improve. 1. Apply the ‘Backup-VM’ caching policy to your Backup proxy VMs. 2. The VM that is being backed up needs to be cached by VirtuCache either using the Write-Through or…

01 Jan: VMs with Duplicate BIOS UUIDs when using Datrium Cloning

VMware VMs have two UUIDs – BIOS UUID and instance UUID. VirtuCache doesn’t support Write-Back policy where multiple VMs in the same vCenter share the same BIOS UUID, even if these VMs have different Instance UUIDs. When using the cloning feature in Datrium (now end of lifed), the cloned VM…

14 Jul: Ensuring that Infinio is uninstalled before installing VirtuCache

A prerequisite to installing VirtuCache is that all other host side caching software be uninstalled. Infinio is one such host side caching software, recently end-of-lifed. Below are steps to ensure that Infinio is indeed removed from the ESXi host. SSH to the ESXi host and make sure the below command doesn’t…

18 Nov: VMs not in Write-Back mode because of Multi-Writer VMDK

In rare cases, one or more VMDKs on a VM could have its ‘sharing’ field (drop-down field in ‘Edit Settings’ at the VM level) set to multi-writer, in which case it is not possible to move that VM to Write-Back caching mode. Such VMs can only be set to ‘Write-Through’…

18 May: VMs don’t show in VirtuCache GUI due to intermittent Datastore connectivity

VirtuCache performs disk heartbeats periodically. If there are Datastore connectivity issues in VMware, these disk heartbeats may fail intermittently, in which case VirtuCache treats the Datastore as unreachable and VMs that are in the Datastore don’t show in the VirtuCache GUI. VirtuCache takes this precautionary measure to prevent the Administrator from changing…

27 Mar: SSD failure alert in vCenter

If a SSD starts to fail, it first starts to slow down , especially for writes, then it becomes read only , and at that point VirtuCache is not able to write to the SSD so VMs and Datastores move to uncached mode automatically. Your VMs go back to performing as…