Archive: Posts

How to Select SSDs for Host Side Caching for VMware – Interface, Model, Size, Source and Raid Level ?

A high queue depth RAID controller and an enterprise grade SSD in the ESXi host are the key to a low latency ESXi + storage environment that is also reasonably priced. This blog article will cover the below topics - Selecting SSD interface type – SATA, SAS, or PCIe (also called NVME)? - Sizing the SSD? - How many SSDs are needed in a VMware host and across the VMware cluster? - The need to RAID0 the SSD? - Where to buy the SSD...

Virtunet’s Write-Back (Read+Write) Caching Competing with Write-Through (Read-Only) Caching at a Large School District

Host side caching software needs to accelerate both reads and writes especially in light of increasing competition from all-flash arrays. Caching writes is important even for workloads that are read intensive. If we were not to accelerate writes, the reads behind the writes on the same thread will not be accelerated, thus slowing reads as well. Using TPC-C benchmark, we showed 2x improvement in performance versus a read caching software vendor at a large...

VirtuCache Improves Hadoop Performance within VMs at Stanford

Typically Hadoop workloads are run on bare-metal servers. However since Stanford’s School of Medicine was 100% virtualized, and because their security, monitoring & management tools were integrated within VMware, it was easier for them to deploy Hadoop within VMs, instead of provisioning new physical servers. The biggest challenge Stanford faced with Hadoop VMs was low throughput and high latencies for writes to disk. Deploying VirtuCache resulted in write latencies in Hadoop reducing...

VirtuCache Improves Performance of Healthcare Imaging Application deployed in VMware VMs

EHR, imaging, analytics, desktop & application virtualization applications are prone to storage performance issues in VMware, that are easily solved with VirtuCache.

VirtuCache Improves the Performance of Equallogic Appliances for VMware VMs and Bare-Metal Linux Servers

By deploying VirtuCache in Dun & Bradstreet's VMware environment, we demonstrated sub 10ms VM latencies for high, write-intensive, random storage IO, which in turn facilitated the P2V of their database servers.

An Order of Magnitude Improvement in IOPS and Latencies using SQLIO Benchmark

Performance Benchmark using SQLIO that compares Storage I/O with and without VirtuCache

VirtuCache Performance Benchmarks Using Iometer

Performance benchmark using Iometer comparing Storage I/O with and without VirtuCache, with multi-threaded 67% read 33% write workload that saturated the disk.

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