SSD Cache drive recommendation help


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My current server runs FreeNAS, which I have booting from mirrored 40 gig Intel SSDs.  I dead-set on moving over to UnRAID and I won't need these drives for boot purposes anymore.  Would two 40 gig SSD drives be useful for cache drive purposes or is that not enough space to bother in UnRAID?  I have five 5TB drives and eight 2TB drives.  I plan to buy one more 5TB drive (or 6TB) and run everything with dual parity, slowly replacing all the drives with 6TB drives.  But the drive upgrade process will be slow going for sure.  It's all hooked through a dual Xeon setup with 64 gigs of ECC ram.  Probably overkill for UnRaid but it was all very useful in FreeNAS.  Regardless it's time for me to ditch that scene and UnRAID is where I'm headed.  So, I'm wondering if I should bother doing anything with the SSDs or just remove them from the system.  Thanks for the help.

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