If you are experiencing high write latencies in VMs when using an EMC Unity Hybrid array, it could be because the caching and tiering solutions in Unity don’t cache random small block writes, and your applications might be generating large volumes of such storage IO.
Parag Patkar
The big difference between the two is that VSA can cache a maximum of only 2GB of reads from the Master VM on a per host basis.1,2 VirtuCache caches reads and writes from all server & desktop VMs, and it can cache to TBs of in-host SSD/RAM, with the goal of…
SSDs deployed in CEPH OSD servers, whether for caching / journaling or primary storage, are not very effective from a performance point of view. The problem lies not in the SSDs, but because they are deployed at a point in the IO path that is downstream (in relation to VMs…
The biggest differences are: Virtunet’s VirtuCache accelerates reads and writes. Infinio Accelerator accelerates only reads. Infinio doesn’t support Linked Clones or Instant Clones, hence VDI is not supported. We support all VDI features in VMware Horizon and Citrix. With us, you can apply caching policy at the datastore and/or VM level versus…
Update as of August 2020 – Datrium has recently been acquired by VMware and as a result, has announced the end-of-life for their DVX product line. Original post follows. In our first article, we explained the differences between our host side caching software (VirtuCache) and Datrium’s (DVX DiESL). To summarize…
Update as of August 2020 – Datrium has recently been acquired by VMware and as a result, has announced the end-of-life for their DVX product line. Original post follows. Both Datrium and us differentiate from the rest of the storage appliance vendors in that both of us cache data to…
ServiceNow’s Dev/Ops team wanted to improve storage performance from their existing HP 3PAR all-flash storage appliance and iSCSI storage network. VirtuCache Deployment Virtucache was installed on 24 ESXi hosts caching to 1.6TB PM1725 PCIe flash cards. Each PM1725 SSD was performing at between 100-250MBps throughput at 1-5ms VM level latencies….
April 15, 2020: City of Mountain View is using VirtuCache to improve the performance of Netapp’s Ontap Select storage software. They were one of our first customers to upgrade to ESXi 7.0 and so they had to upgrade VirtuCache as well. We announced General Availability of VirtuCache for ESXi 7…
There are only a few applications, financial trading software being one example, that require very low latencies, lower even than what’s possible with an all-flash array (AFA). VirtuCache caching to in-host RAM results in lower VM latencies than an AFA. This is because RAM latencies are an order of magnitude…
Dell’s PowerEdge VRTX hyper-converged appliance can either have all hard drive datastores or all SSD datastores, but you can’t have SSDs act as tiering or caching media for VRTX volumes. That’s where VirtuCache comes in.