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As data centers continue to virtualize more of their workloads, the reality is there are only a few use cases today that are not virtualized on a regular basis. This means that the dependance on shared storage is also increasing. The fact that the majority of performance issues in virtualized environments are storage related is cause for admins and architects to continue their search for improving performance. One of the hottest new technologies in this pursuit of better performance is server-side caching.
Server-side caching is a method of using a local caching point to accelerated reads, writes, or both. The local caching points are most commonly local flash storage in the server, but they could also be using local server memory. Typically the goal is to cache the commonly used data in this layer so that when it’s accessed again it can be read locally without the need to go all the way back to shared storage. This typically lowers the latency and increases the IOPs.
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Over the past 12 to 18 months this market has seen a lot of companies announce and release products. I’m going to cover some of the ones that I have personally used or spoken with. This list is sure to not cover every option available today, but will hit on the leading ones for the VMware space.
PernixData – The FVP product offers a local cache that utilizes dedicated local flash storage in your VMware hosts. This flash could be SSD drivers of PCIe flash cards. The product support block-based storage today.
Infinio – The accelerator product from Infinio was just recently released to the public. It uses virtual appliances on each host that use 8GB of server memory as the caching layer. The appliances unify together in a vSphere cluster to create a larger deduplicated cache layer. The product only support NFS in this 1.0 version.
SanDisk – The FlashSoft product also builds a local cache layer using local flash disks or PCIe flash.
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VMware – Recently as part of vSphere 5.5 VMware has release the vFRC feature which uses local flash storage as its caching layer. This product has the bonus on being part of VMware, but the current version offers some challenges with implementation. The process is a bit more manual than it needs to be today on a per VM basis. It will sure draw attention since its a VMware offering.
In reality, server-side caching can likely help with almost any workload to some effectiveness, but there are a few that seem like a slam dunk.
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Whether you have any of the use cases that I mentioned above, I think that server-side caching can help nearly everyone. The entry cost can be relatively low (though there are others that are more expensive but offer additional benefits). I’m confident that we have not heard the last of this caching technology and I think this market will only continue to become a more important segment in the data center.
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