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Date: Mon, 19 Oct 2015 18:11:23 -0400
From: Quartz <quartz@sneakertech.com>
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Subject: Re: PCI-E SSD cards
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> I was looking at adding an ssd for a zil and/or l2arc to my zfs pool
> but all my hard drive bays are full.  I have free pci-e slots, so I
> started looking at using that instead of a physical drive.  Does
> anyone have any experience with these ssd pci-e cards in FreeBSD?

Your bays are full, but are you using all the sata ports on your board? 
You can get simple brackets that let you mount a normal sata drive in a 
pci slot (no connection to the actual slot connector). If your slots are 
all spoken for, you could combine a bracket with a generic sata card in 
another slot (assuming you have multiple slots free).