Don't forget your cabinets and UPS, if you have 
UPS on each cabinet, don't forget to balance the 
electricity load even if you have to make a few 
electric cords stretch to other cabinets.

During power outages our UPS would handle things on
our 959KS and 40 drives without a glitch.  When we
added 16 more drives, the next power glitch caused
our system to halt, even though we added another
UPS and cabinet.

Then I balanced the load on the cabinets, a little
more evenly, our HP3000 sailed right through the
recent power outages.

BT
NNNN
Tracy Johnson
MSI Schaevitz Sensors 

> -----Original Message-----
> From: Stan Sieler [mailto:[log in to unmask]]
> Sent: Wednesday, September 25, 2002 8:41 PM
> To: [log in to unmask]
> Subject: Re: [HP3000-L] Adding Disc Drives
> 
> 
> Re:
> > drives into the HPe3000 969/220 that we currently have. The 
> two discs are
> > the same model as the ones that we currently use on the 
> 3000. We would like
> > to add these discs to our CUTEST volset. The first scsi 
> slot on the back of
> 
> Hmmm...normally, cuteness isn't a criteria for which volume set
> to add a disk drive to :)
> 
> 
> > the 3000 is full, but the second scsi slot is available. We 
> do not want to
> 
> Then add them on the second SCSI chain :)
> 
> At some point you ought to look at how the disk drive I/Os 
> are distributed,
> and considering balancing them by moving disk drives from one 
> SCSI card
> to another.  (That assumes that both SCSI cards are of the same kind
> (e.g., both Single-Ended, or both Fast/Wide).)
> 
> With the exception of LDEV 1, MPE generally doesn't care which LDEV a
> given volume appears at, so you could swap the disk drive 
> that is volume W of
> set X on SCSI card A at SCSI id Y with the disk drive that is 
> volume K of set L
> on SCSI card B at SCSI id Z, where X/X/Y/K/L/Z are pretty 
> much independent
> of each other ... being sure to change the two SCSI ids to 
> each other's values.
> 
> 
> --
> Stan Sieler
> [log in to unmask]
> www.allegro.com/sieler/wanted/index.html
> 
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