On Tue, 30 Dec 2014, Douglas Gilbert wrote:
> IMO about the best SATL is in the MPT SAS-2 and SAS-3 HBAs and
> here is that page for a SAS expander attached SATA disk:
> # sg_vpd -p bl /dev/sg3
OP here. FWIW, this is what I get when running that command on the SCSI
generic device that corresponds to the USB-3 (non-UAS) disk[1] that had the
issue:
----
$ sudo sg_vpd -p bl /dev/sg4
Block limits VPD page (SBC):
Write same no zero (WSNZ): 0
Maximum compare and write length: 0 blocks
Optimal transfer length granularity: 1 blocks
Maximum transfer length: 8191 blocks
Optimal transfer length: 8191 blocks
Maximum prefetch length: 8191 blocks
Maximum unmap LBA count: 0
Maximum unmap block descriptor count: 0
Optimal unmap granularity: 0
Unmap granularity alignment valid: 0
Unmap granularity alignment: 0
Maximum write same length: 0x0 blocks
$
----
If more info is needed, just let me know.
-Kenny
[1] - SCSI generic devices follow "/proc/scsi/scsi" order, right?
--
Kenneth R. Crudup Sr. SW Engineer, Scott County Consulting, Silicon Valley
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