John Doe wrote: > From: Drew Weaver <drew.weaver at thenap.com> > >> If these drives do not have TLER do not use them with LSI controllers. > > Not sure about TLER on those Plextors... <snip> TLER would only show up on something that looks at a *very* low level on the physical drive. What I know is that you can see it with smartctl - from the man page: scterc[,READTIME,WRITETIME] - [ATA only] prints values and descriptions of the SCT Error Recovery Control settings. These are equivalent to TLER (as used by Western Digital), CCTL (as used by Samsung and Hitachi) and ERC (as used by Seagate). READ- TIME and WRITETIME arguments (deciseconds) set the specified values. Values of 0 disable the feature, other values less than 65 are probably not supported. For RAID configurations, this is typically set to 70,70 deciseconds. Note that knowing this was the result of a *lot* of research a couple-or so years ago. One *good* thing *seems* to be WD's new Red line, which is targeted toward NAS, they say... because they've put TLER back to something appropriate, like 7 sec or so, where it was 2 *minutes* for their "desktop" drives, and they disallowed changing it in firmware around '09, and the other OEMs followed suit. What makes Red good, if they work, is that they're only about one-third more than the low-cost drives, where the "server-grade" drives are 2-3 *times* the cost (look at the price of Seagate Constellations, for example). mark