Attempting ATA TRIM on SAS devices?

[Garrett Wollman]

<<On Thu, 9 Jan 2014 00:14:02 -0000, "Steven Hartland" <killing at multiplay.co.uk> said:

>> I'm not sure that that works, given that the zpool is auto-imported at
>> boot time and I don't know which da units will be assigned to the SSDs
>> in question (no way to pin them so far as I can tell).  Does ZFS
>> generate BIO_DELETE on the cache devices at any time other than pool
>> import?

> Yes on every delete,

What do you mean by "on every delete"?  Do you mean whenever a block
is evicted from the L2ARC?

-GAWollman