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Promise vTrak Ex30 – Xsan
Hopefully a simple question. I have a Promise vTrak E630fD 16 bay dual controller RAID that I’m configuring for use with Xsan in a uncompressed video serving environment. From research, it’s my understanding that the optimal configuration (according to Apple) for uncompressed video is a metadata LUN and four data LUNs. It’s unclear whether this configuration is to be achieved using a single dual controller RAID or in conjunction with a expansion bay.
In other words, my question is would I achieve any performance benefit from creating two data LUNs on my RAID (each consisting of 6 drives in level 5) or four data LUNs (each consisting of 3 drives in level 5) along with one metadata LUN. I know four data LUNs is the optimal choice for performance, but is there a performance increase with level 5 RAIDs when setting up multiple LUNs per controller? I know that I’ll lose some additional storage space (2 x 2TB in this case) as well as reduce the likelihood of failure since I’m reducing the size of the level 5 array, but will I see any real performance increase from doing so? Thanks!
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