On Fri 22 May 2015 03:38:06 PM Mikael Abrahamsson wrote:

On Thu, 21 May 2015, Thomas Fjellstrom wrote:

quoted

quoted

for x in /sys/block/sd[a-z] ; do

         echo 180  > $x/device/timeout

done

I presume it's ok to do that even if the drives do ERC/TLER? Just woke up,
but my brain seems to be telling me it shouldn't break anything since the
ERC drives should always return after 7s no matter what...

Correct, the only downside is that if the drive really dies, it's going to
take longer to detect this.

I'd rather have longer timeouts to make sure drives never kicked out
because of lack of ERC or something else, than to have drives kicked for
some reason (controller reset, lack of ERC, or something else).

I really really want to avoid drives being kicked for any other reason
than them really being dead. I'd rather have reads stalled for a few
minutes than this happening. For other use-cases, the requirements may be
different.

Yeah, I agree. Especially given this is just my home nas and nas backup setup, 
It's better to just stall rather than die horribly.

-- 
Thomas Fjellstrom
thomas@fjellstrom.ca