Archive: Posts

High Speed Storage is Back in the VMware Host with Hyper Converged Infrastructure and Host Side Caching, but the similarities end there….

The main advantage that hyper-converged infrastructure(HCI) has over traditional converged infrastructure (separate hardware for compute and storage) is that HCI has put high speed storage back in the compute nodes. This is also true for Host Side Caching software, with the added benefit that host side caching maintains the flexibility that Converged Infrastructure (CI) always had over HCI, that of being able to scale and do maintenance on compute and storage hardware independently of each...

Storage IO path in VSAN versus VirtuCache Host Side Caching.

Storage IO path in VSAN and VirtuCache are similar to a large extent, since both service storage IO from in-VMware host media. Though with VirtuCache, storage latencies are lower than with VSAN for four reasons: Reads are almost always serviced from local cache media in VirtuCache. In VSAN there is a high chance that all reads might be serviced over the network from another host; In addition to SSD, with VirtuCache you can cache to RAM which is the highest performing media there is,...

VMware’s vFlash Read Cache (VFRC) versus Virtunet’s Read+Write Caching

VMware will discontinue VFRC starting in ESXi 7.0 to be released in Q4 2019. 0 Despite the end-of-life announcement for VFRC, if you still want to review the differences between VFRC and VirtuCache, below are the three most important ones. We cache reads and writes, VMware's VFRC caches only reads. Caching writes improves the performance of not only writes, but also of reads.1 We require no ongoing administration. Caching in our case is fully automated, and all Vmware features are...

CEPH Storage for VMware vSphere

CEPH is a great choice for deploying large amounts of storage. It's biggest drawbacks are high storage latencies and the difficulty of making it work for VMware hosts. The Advantages of CEPH. CEPH can be installed on any ordinary servers. It clusters these servers together and presents this cluster of servers as an iSCSI target. Clustering (of servers) is a key feature so CEPH can sustain component failures without causing a storage outage and also to scale capacity linearly by simply hot...

Improving Storage Performance of Dell VRTX

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 / virtual disks. That's where VirtuCache comes in.

Citrix MCS IO vs. VirtuCache – Server Side Storage IO Caching

Both cache 'hot' data to in-host RAM, but the differences between Citrix MCS Storage Optimization and VirtuCache are many. The top three are: - MCSIO works only for non-persistent Xenapp / Xendesktop VMs.1 VirtuCache works for all VMs on the ESXi host; - Citrix MCSIO can cache only VM writes and to VM RAM only.1 VirtuCache can cache VM reads and writes to in-host SSD or RAM; - With MCSIO there will be VM data loss / instability if the host fails or the RAM cache is full,1 not so...

Improving Performance of Log Management Application at a Service Provider

Business Intelligence, Log Management, Security Information & Event Management (SIEM), Search and Analytic software like Splunk, Elastic Search, Cognos, HP Vertica, HP Autonomy, need to provide real-time visibility into large volumes of fast changing data. When these applications are deployed in traditional VMware VMs connected to centralized storage, such large volume of write and read operations puts pressure on existing storage infrastructure resulting in much slower than real-time...

GUI comparison, PernixData FVP vs Us – VMware Write Back Caching Software.

For the most part both our GUI and workflows are similar. This article compares, with screenshots, steps to install and configure VirtuCache and PernixData FVP. The only differences between us and Pernix stem from the fact that we leverage VMware's own capability in the areas of clustering, license management, and logging, whereas Pernix programmed these features separately within their software. Overall these additional screens add a few clicks and pages in Pernix versus us, but again I...

Improving VDI Performance at Fairbanks Sewer and Water

Fairbanks Sewer and Water (FSW) wanted to improve the performance of their server VMs (especially their server VMs running SCADA) and Horizon View virtual desktop VMs. Their virtual desktop VMs were exhibiting all the classic symptoms of storage related issues – cursor freezes, long boot times, long VM provisioning times, jittery audio/video.

A Counter Intuitive Approach to Solve the High Capacity, Low Latency Requirements for Video Storage

By not using dedupe, compression, or RAID, using slow HDDs in centralized storage, and moving SSDs to compute hosts, we arrived at low price per capacity and performance for video storage.

Here are unique requirements of video storage, some are obvious and others not so much, that inspired us to put together a different architecture than the conventional storage OEM design.

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