On 09/26/2012 05:08 PM, Matt Van Mater wrote:
> I've looked on the mailing list (the evil tuning wikis are down) and
> haven't seen a reference to this seemingly simple question...
> I have two OCZ Vertex 4 SSDs acting as L2ARC.  I have a spare Crucial SSD
> (about 1.5 years old) that isn't getting much use and i'm curious about
> adding it to the pool as a third L2ARC device.
> Is there any reason why I technically can't use different capacity and/or
> manufacturer SSDs as a single ZFS pool's L2ARC?

No, there isn't. You can do it without problems.

> Even if it will work technically, will this configuration negatively impact
> performance (e.g. slow down the entire cache to the slowest drive's
> performance)?

If the added device is slower, you will experience a slight drop in
per-op performance, however, if your working set needs another SSD,
overall it might improve your throughput (as the cache hit ratio will

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