Even if you have a fast array and storage network, and you are still experiencing high storage latencies for your high throughput VMs, it might be because of choked Queue Depths at the VM and virtual LUN device in the host. This problem will happen only if a few VMs…
VirtuCache
If your SQL Server runs in a VMware VM and it has performance issues, the root cause of which is slow storage, then our host side caching software for VMware, called VirtuCache, will be able to fix this problem. This post explains how VirtuCache does this by explaining the read…
If your Veeam backups take a long time to complete or if they fail entirely; VMs freeze during backups; you see disk consolidation errors in vcenter; or if you simply want to speed up your backups, then our VirtuCache software is relevant. VirtuCache Configuration to Speed Up Backup Times in…
VMware has two categories of SSD Host Caches — those that swap out memory contents to SSD when host memory is full, and those that cache storage requests to host Flash / RAM. In the former category are the below VMware features. VMware’s ‘Host Cache Configuration’ feature VMware’s ‘Virtual Flash…
The big difference between the two is that VSA can cache only reads and only from the Master/Replica VM in Horizon VDI.1,2 VirtuCache caches reads and writes from all server & desktop VMs, and it can cache to TBs of in-host SSD or RAM, with the goal of servicing all storage…
If performance issues in SQL Server are caused by slow storage1 in VMware, then VirtuCache software is the quickest and simplest way to fix this issue. You install VirtuCache software in VMware vSphere host. It then automatically caches all reads and writes from VMs to any SSD or RAM in…
Back when I founded Virtunet in 2010, VMware VSAN had started to effectively compete with SAN arrays. The appeal of hyperconverged infrastructure was obvious, getting rid of a separate storage appliance and having Flash memory right on the VMware host was the highest performing storage configuration. For a small 3-4…
Typically, you would want to improve both read and write latency in VMware. But if your VM write latency is already quite low and it is only your read latency that is high, then it is understandable that you would want to improve only disk read latency in VMware. Improving…
If you have high disk IO write latency in VMware at the VM, Datastore, or Device level, then you could fix this issue in either of three ways – tinker around the edges in VMware, get a fast storage array and network, or use host side cache.