Re: Running AS/400 with cover off and care of Drives -- MIDRANGE-L

Thanks Adam,
Obviously there is a serious problem with a batch of the 6606s.
I suspect only went out in your local US Market.What you described to me was
a production fault--a failure on first ever powerdown quite different from a
normal wear and tear cold start problem.

--I would be tempted to get IBM to change all the 6606 disks as clearly you
have been sold a bad batch
I have left my Model 500 powered down for 2  weeks once  and touch wood no
problems yet!

cheers Dave

-----Original Message-----
From: Adam Driver <adam_driver@yahoo.com.au>
To: MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
Date: Wednesday, 7 June 2000 17:22
Subject: Re: Running AS/400 with cover off and care of Drives


>David,
>
>We have model 6606 and 6607 disks, and yes, we've had
>problems with extended power down time. We generally
>do a scheduled IPL with RESTART(*YES), so the disks
>don't stop spinning. However, a couple of months ago
>we had to power down for a couple of hours due to a
>combination of a mains power failure and our backup
>generator also failing. After being off for about 4
>hours we powered up the machine and 3 disks wouldn't
>start. We got an IBM hardware tech out and he fixed 2
>of them by blowing on them and tapping them on the
>floor. The third had to be replaced. The one replaced
>was a 6606. Can't remember whether the other 2 were
>6606's or 6607's. The IBM tech pretty much said the
>same to me that your friend did. We have a test AS/400
>with 6714 disks that has been powered down for days at
>a time sometimes. We've never had a problem with these
>disks when it's restarted.
>
>Thanks
>
>
>--- DAVID BULOG <d2ba@xtra.co.nz> wrote: > Hi list,
>> I was wondering if you can advise me as to whether I
>> should
>> be running my Model500 with the rounded rear cover
>> on or off.
>> I could find no specific IBM reference as to what is
>> the correct way but am
>> I correct in assuming that I should run with the
>> rear cover attached as this
>> acts as a shield to circulate the air back towards
>> the cards etc.
>>
>> Another question is Harddrive care--my model 500 has
>> 18gig total
>> 2 x 6606, 2 x6607, 1x 6713.Are any of these models
>> prone to sticking after
>> long powerdwn periods.
>> Since I have the machine at home for the purpose of
>> playing with the project
>> lightening toolkit I only powerup one day a week for
>> aboubt 4 hours at a
>> time--How much of a risk Im I taking--I know
>> Quantem SCSIdrives on PCs are really bad,but IBM
>> drives are
>> much more reliable(I only use SCSI Ultrastars on my
>> PCs and have
>> never had a failure--they get a real thrashing to!
>> What I dont know is how good the AS/400 drives are
>> compared
>> to the IBM ultrastar PC drives,I have heard a rumor
>> that the AS/400s are top
>> end Ultrastars with a special logic board??
>>
>> My friend Andree says you should never
>> powerdown because spinning the drives does not cause
>> the wear and tear its
>> the cold starts--in fact he almost guarentied in
>> theory that if you left a
>> brand new or near new IBM drive in its box for years
>> it would be useless as the bearings would be
>> stuck--stranglely
>> enough he has recovered data for clients by carefuly
>> taking apart and
>> spinning by hand to give a quick start and then
>> transfering the data on to
>> another drive and throwing the damaged one away
>>
>> Dave
>>
>> +---
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>
>
>=====
>Adam Driver
>AS/400 Systems Support Specialist
>
>___________________________________________________________________________
__
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+---
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