On Fri, Nov 07, 2008 at 12:08:01AM -0800, Artem Belevich wrote: > > Note that Western Digital's "RAID edition" drives claim to take up to 7 > > seconds to reallocate sectors, using something they call TLER, which > > force-limits the amount of time the drive can spend reallocating. TLER > > cannot be disabled: > > TLER can be enabled/disabled on recent WD drives (SE16/RE2/GP). SE16/GP > come with TLER off, RE2 with TLER on. Google WDTLER utility. > It can apparently be obtained from WD by asking them nicely. > Or, yet again, google is your friend. Here's one example - > http://www.hardforum.com/archive/index.php/t-1191548.html
Thanks for the information. Nice to know one of their FAQ entries is false. Also, note that "SE16/RE2/GP" is not specific enough; I have SE16 drives from 2005, and I highly doubt those have TLER capability due to their age. Also, there's a Wikipedia article on this whole fiasco. http://en.wikipedia.org/wiki/Time-Limited_Error_Recovery It also appears Samsung drives have a similar feature called CCTL, which uses a value of 7 or 8 seconds: http://www.samsung.com/global/business/hdd/learningresource/whitepapers/LearningResource_CCTL.html But regardless of TLER being toggleable, FreeBSD's ATA command timeout of 5 seconds is too aggressive, and should be increased. Likewise, the value should be a sysctl, so those who do want such aggressive values can use it at the community's -- or their own -- behest. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"