Re: A1000: Determining bad disk

From: Darren Dunham (ddunham_at_redwood.taos.com)
Date: 09/29/03 

Date: Mon, 29 Sep 2003 16:22:39 GMT

In comp.unix.solaris Vikas Agnihotri <fornewsgroups@vikas.mailshell.com> wrote:
>>>> I suspect the disk is going bad.
>>
>> Why? If you do, you should run rm6 and run a healthcheck.

> I dont like the rm6 GUI, the CLI equivalent is 'healthck', right? I did a
> 'healthck -a' and got 'Optimal'. I didnt expect anything else.

Then why do you think a disk is going bad?

> I dont know how thorough 'healthck' is anyway. Say the disk was going bad,
> and I knew about it proactively, I could, on-demand, mark the drive failed
> using 'drivutil' and take the reconstruction hit when I want to instead of
> waiting for it to happen anytime!

I suppose, but what makes you think a disk is going bad?

> How about 'parityck', is that a more exhaustive disk check?

> Anyway, in this particular case, as it turned out, my SCSI errors were due
> to the "disconnected tagged commands", for which Sun support suggested that
> I consider reducing 'set sd:sd_max_throttle' (in /etc/system) to something
> like 10 (default is 256) or so.

Yes. That's what I was (badly) trying to say. Since the OS can't "see"
any of the disks anyway, any scsi errors in /var/adm/messages will be
unrelated to disk errors. They would have to do with the RAID
controller, the cable, the host adapter, and any scsi settings.

> Is this common practice to throttle down the 'sd' driver with the RAID
> A1000? Is this because the disks are too fast for the sd driver? [Or is it
> the other way around?]

Which adapter is this? I see a Sun Alert here...

http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert/22803 

-- 
Darren Dunham                                           ddunham@taos.com
Unix System Administrator                    Taos - The SysAdmin Company
Got some Dr Pepper?                           San Francisco, CA bay area
         < This line left intentionally blank to confuse you. >

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