Re: odd selftest log on an OCZ VERTEX PLUS SSD

Richard Flint wrote:
> Hi,
>
> Thanks for the clarification. I accept your point that querying some 
> data requires support for 48-bit ATA commands whilst other data can be 
> queried using 28-bit ATA commands. What confuses me is that when 
> comparing the output of
> "sudo smartctl --xall xselftest -dsat,12 /dev/rdsk/c7t5d0" and "sudo 
> smartctl --xall xselftest -dsat,16 /dev/rdsk/c7t5d0", the latter 
> returns more data (e.g. the SATA Phy Event Counter log) than the 
> former. If the environment does not support the longer ATA command (as 
> mine apparently doesn't)  I wouldn't expect -dsat,16 command to return 
> more data then dsat,12.
>

Again this is as expected. The option -d sat,12 selects SAT 
ATA-PASS-THROUGH(12) which does not support 48-bit ATA commands.

Note that smartctl prints "48-bit ATA commands require SAT ATA 
PASS-THROUGH (16)".

Always use -d sat[,16] if supported by the SAT layer.


------------------------------------------------------------------------------