On Mon, 22 Jan 2007, kyle wrote:
Hi,
Yesterday I tried to increase the value of strip_cache_size to see if I
can
get better performance or not. I increase the value from 2048 to
something
like 16384. After I did that, the raid5 freeze. Any proccess read / write
to
it stucked at D state. I tried to change it back to 2048, read
strip_cache_active, cat /proc/mdstat, mdadm stop, etc. All didn't return
back.
I even cannot shutdown the machine. Finally I need to press the reset
button
in order to get back my control.
Yes, I noticed this bug too, if you change it too many times or change it
at the 'wrong' time, it hangs up when you echo numbr >
/proc/stripe_cache_size.
Basically don't run it more than once and don't run it at the 'wrong' time
and it works. Not sure where the bug lies, but yeah I've seen that on 3
different machines!
Justin.
I just change it once, then it freeze. It's hard to get the 'right time'
Actually I tried it several times before. As I remember there was once it
freezed for around 1 or 2 minutes , then back to normal operation. This is
the first time it completely freezed and I waited after around 10 minutes it
still didn't wake up.
Kyle
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