RE: LOR on current

From: Scott Long [mailto:scottl_at_freebsd.org]
> Don Bowman wrote:
> > From: Kris Kennaway [mailto:kris_at_obsecurity.org]
> > 
> >>On Wed, Mar 24, 2004 at 03:23:36PM -0500, Don Bowman wrote:
> >>
> >>
> >>>>Right, I think that's not the cause of your lockup :)
> >>>
> >>>Not being one to believe in coincidences... I'm typing 
> >>>on the serial console. The machine halts, i can no longer type.
> >>>some seconds pass, out pops that message. This time too it
> >>>returned. Most times (when i run two postgresql vacuums 
> >>
> >>simulatenously
> >>
> >>>for example), that's the end of it.
> >>>
> >>>I will continue to investigate.
> >>
> >>Check for disk problems..I have often experienced hangs or 
> lockups on
> >>machines with faulty disks.
> > 
> > 
> > 6-disk raid 5 behind ASR. All disks report optimal, controller
> > reports optimal. I know the hangs you mean, from the vm
> > swapin etc which holds all the locks. I don't think this
> > is they.
> > 
> > with ahd i would get scsi sense errors in the log for machines
> > with problems [CRC errors etc], i don't have a for what asr does 
> > in this case.
> > 
> > ran a 96 hour memory test (memtest86), with ecc checking, there
> > were no soft or hard errors. Ran machine to 40 degrees C ambient
> > in environmental chamber, its all good. Its got 3 power supplies,
> > all are operational, fed from UPS.
> > This is a software problem somewhere I think.
> > 
> > I'm curious, how many people use ASR with current? It seems
> > like it might be somewhat unloved.
> > 
> 
> It is unloved.  Adaptec provides no official support for it, and I
> have many more things that are a higher priority.  I'm not against
> working on it, but it's hard to justify it at the moment.  Anyways,
> it wouldn't surprise me if the controller or driver was going out to
> lunch and stalling the VM, but we probably need to do a lot more
> investigation to support that.  I assume that you have both 
> WITNESS and
> INVARIANTS turned on?

witness and invariants are indeed on.
can i switch asr to aac without reformatting my disks?