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SSD Caching in ESXi5

Y

yinan

Golden Member
Has anyone used this feature yet? I was considering getting a couple small 20GB drives to increase performance in my home lab.

Any comments?
 
Instead of writing to slower media, it will temporarily write to the SSD before it writes to the permanent location.
 
Are you talking about HostCache AKA "swap to SSD"? It is nice if you are memory constrained, but it is no substitute for more RAM. It basically uses SSD for swapping instead of slower disks.

Your description makes it sound like some sort of disk cache, that is not what it is.

Other SSD caching is not in 5.0 AFAIK.
 
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swap file's have always been virtualized so if you had local storage (pair of 15K sas drives for boot) and iscsi - you could store the pagefile for the windows machines on the local drives and use the much slower(higher latency) iscsi for the rest.

SQL server does this already - it's called journal ling - you fsync the log partition and do really lazy writes to the core database and with copy on write/ntfs you can survive some nasty outages with log playback and not much damage if at all.

it would be nifty if esxi 5 actually did this for us. specify log drive raid-1 of two SSD and do lazy writes - but honestly i'd rather the SAN take care of that. just a trust thing.
 
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