Attempting ATA TRIM on SAS devices?

[Steven Hartland]

----- Original Message ----- 
From: "Garrett Wollman" <wollman at csail.mit.edu>


> <<On Wed, 8 Jan 2014 23:57:57 -0000, "Steven Hartland" <killing at multiplay.co.uk> said:
> 
>> You could just force the delete_method to UNMAP then:
>> kern.cam.da.X.delete_method=UNMAP
> 
> 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, once a delete method has failed though it wont
be tried again so the only real side effect is that the first delete
will be attempted twice, so if you can live with that and cant
get a fixed FW for the disk then...

    Regarsd
    Steve

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