Messages in this thread | | | From | "kyle" <> | Subject | Re: change strip_cache_size freeze the whole raid | Date | Mon, 22 Jan 2007 21:09:58 +0800 |
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> > 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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