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 district.
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 to an eighth of what they were before.
EHR, imaging, analytics, desktop & application virtualization applications are prone to storage performance issues in VMware, that are easily solved with VirtuCache.
D&B uses VirtuCache to Improve 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.
Performance benchmark using Iometer comparing Storage I/O with and without VirtuCache, with multi-threaded 67% read 33% write workload that saturated the disk.