Re: LOR on current

Don Bowman wrote:
> 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?
> 
> 
> 

I beleive so, but I'll have to get back to you on the details.
There might be some gotchas.

Scott