Re: DASD failure

["Denis Robitaille" <DRobitaille@xxxxxxxxxxxx>]

Denis Robitaille
Cascades inc.
Tel: 819-363-5187
DRobitaille@cascades.com

>>> John Hall <jhall@hillmgt.com> 07/22 12:41 pm >>>

>If you are having that many failures maybe you need to look elswhere for
>the problem.  Were all the drives purchased at the same time ?  Is the
>same component failing each time?  Are they in the same cabinet ?  Same
>controller ?

- Purchased at some month interval
- not always the same componant (according to IBM)
- Same cabinet? those are small AS/400, everyting in one box and one controler

>It sounds like a problem outside of the drives.  Could be there is a
>borderline power supply in the cabinets causing the failures.  Maybe bad
>utility power.  Some UPS's only kick in during brownouts & overvoltage
>and do not monitor the line very well for harmonic distortion and
>transients.  

- The UPS are FORTRESS sold to us by IBM

About the time of purchase, when the E (as if  B,C,D,E anf F) model came out, 
we purchase several of them in a short period of time. Well, beleave it or not, 
but in the folowing 18 month we had to replace, due to crashed or just before 
crashes, about "25" drives. It took a while but IBM finally admitted that there 
was a range of disk that were faulty and they replaced all our drive for all 
our machines at the time (about 15). We even had a site that was working 7/24 
that sufered 3 crahsed in one month. Needless to say that our backup procedure 
are proven and well tested.

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