Iustin Pop wrote:
..
Anyways, clarification...
The only reason for TLER (Time Limited Error Recovery) is to behave
"friendly" toward RAID controllers that timeout disks.
In fact, md does not timeout disks as many Hardware RAID controllers do.
So, from md's point of view, TLER is useless, i.e. it has no benefit.
I'm sorry but I disagree here. *Especially* because md is used over
normal SATA controllers most of the time, TLER is beneficial because the
drive doesn't go catatonic for minutes at a time trying to recover a bad
sector, which would (because md doesn't timeout disks) cause md to hung
up the whole device. TLER will allow md to see the error quickly and
attempt to rewrite (read) or retry/fail the disk (write) for a bad the
sector.
Just my understanding of the md stack.
regards,
iustin
I agree.
Before WD implemented this we would see cases quite often where a
perfectly good drive would get "kicked out"
of a RAID as frequently or even more often, than on a hardware RAID.
TLER management seems to have eliminated most of these cases.
--
Regards, Maurice
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