On Sat, 15 Mar 2014 04:25:05 PM Chris Samuel wrote: > I wonder if it would be possible to use that knowledge to extend the > smartctl's --identify functionality to report this?
After reading the SATA 3.1 spec I believe that smartctl *can* indicate if a drive claims to support SATA 3.1 NCQ TRIM, thus: $ sudo smartctl --identify /dev/sdb | fgrep 'Trim bit in DATA SET MANAGEMENT' 169 0 1 Trim bit in DATA SET MANAGEMENT command supported $ If that command returns nothing then it's not reported as supported (and I've tested that). You can get the same info with hdparm -I. Of course, as Martin said, that doesn't necessarily mean the kernel is using that reported ability. My puzzle now is that I have two SSD drives that report supporting NCQ TRIM (one confirmed via product info) but report only supporting SATA 3.0 not 3.1. cheers, Chris -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC
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