>>>>> "bh" == Brandon High <bh...@freaks.com> writes:
bh> From what I've read, the Hitachi and Samsung drives both
bh> support CCTL, which is in the ATA-8 spec. There's no way to
bh> toggle it on from OpenSolaris (yet) and it doesn't persist
bh> through reboot so it's not really ideal.
bh> Here's a patch to smartmontools that is supposed to enable
bh> it. It's in the SVN version 5.40 but not the current 5.39
bh> release: http://www.csc.liv.ac.uk/~greg/projects/erc/
That's good to know. It would be interesting to know if the smartctl
command in question can actually make it through a solaris system, and
on what disk driver. AHCI and mpt are different because one is SATA
framework and one isn't. I wonder also if SAS expanders cause any
problems for smartctl?
also, has anyone actually found this feature to have any value at all?
To be clear, I do understand what the feature does. I do not need it
explained to me again. but AIUI with ZFS you must remove a partially
failing drive, or else the entire pool becomes slow. It does not
matter if the partially-failing drive is returning commands in 30sec
(the ATA maximum) or 7sec by CCTL/TLER/....---you must still find and
remove it, or the zpool will become pathologically slow.
If there is actual experience with the feature helping ZFS, I'd be
interested, but so far I think people are just echoing wikipedia
shoulds and speculations, right?
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