> > Next to that I am reading all kind of performance benefits using seperate > devices > for the ZIL (write) and the Cache (read). I was wondering if I could > share a single SSD between both ZIL and Cache device? > > Or is this not recommended? > > > i asked something similar recently. The answers i got were along these lines:
you can use a single ssd but it's not a great idea. If you DO need to use a single ssd for such a thing, make sure it's one of the more expensive SLC variety like the intel x25-e The MLC variety of SSD works well for L2ARC and is much cheaper (you can pick up some for less than 100 bucks) while the ZIL really should have the SLC variety. I'm not an expert though, i'm just passing on advice i've been given. For reads and dedup L2ARC does make a dramatic difference, and for NFS and database stuff an SSD ZIL will make a huge difference. I've heard of people getting 5-10x's performance increase on reads just by adding a cheap ssd so i'd say it's worth it if that's the type of dataset you have. Another thing i was told on more than one occasion was that you may not even NEED a ssd for your ZIL (basically you should run a script to see if you need a ZIL at all, i don't remember where this script is but i'm SURE someone will reply with it)
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