Re: change strip_cache_size freeze the whole raid

[Justin Piszcz <jpiszcz@lucidpixels.com>]

On Mon, 22 Jan 2007, Steve Cousins wrote:

> 
> 
> Justin Piszcz wrote:
> > 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!
> 
> Can you tell us when the "right" time is or maybe what the "wrong" time is?
> Also, is this kernel specific?  Does it (increasing stripe_cache_size) work
> with RAID6 too?
> 
> Thanks,
> 
> Steve
> -- 
> ______________________________________________________________________
>  Steve Cousins, Ocean Modeling Group    Email: cousins@umit.maine.edu
>  Marine Sciences, 452 Aubert Hall       http://rocky.umeoce.maine.edu
>  Univ. of Maine, Orono, ME 04469        Phone: (207) 581-4302
> 
> 
> 

The wrong time (for me anyway) is when/or around the time in which kernel 
is auto-detecting arrays/udev starts, when I put it there I get OOPSES all 
over the screen and it gets really nasty.  Basically the best time appears 
to be right after the system has started up but I/O hasn't started hitting 
the array yet.  Tricky, I know.

Justin.