Chuck Munro wrote:
<snip>
> As an aside, I have used only WD Black and WD RedPro drives for RAID,
> and not had any issues. Green drives are scary :-)
It's the TLER that kills you. We tried some early 3TB greens in some of
our Penguins (OEM, rebranded Supermicro), and within a month, they'd start
giving DRDY errors. It turns out that there were two issues:
1. They keep trying to spin down; ok in desktops, bad, bad, bad on
servers.
And this is *not* RAID, just as a plain vanilla drive.
2. Around '09, led by WD, they changed the firmware. Previously, you could
use hdparm to set the TLER; after then, it was not user settable.
TLER: if the drive finds a bad sector, this is how long it will
retry
before giving up, and rewriting it to another sector, marking
that bad.
The greens try for up to two ->minutes<-; servers' firmware
expects this
to happen in < 7 ->seconds<-. System is *not* happy....
mark
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