You might check that your power supply(s) are beefy
enough.  I've got some old DEC BA30? StorageWorks cabinets
that'll do great with 6 RZ26 or RZ29 (1.2 or 2.? GB DEC
drives) and the antique MYLEX controller it came with. 
Running the same cabinet off of an Adaptec AAA-131U2 adapter
(SCSI-3) if you try to use 4GB and/or 10,000 RPM drives you
can only use up to 4 drives.  No obvious problems when you
plug in all 6, except that initializing the array _always_
fails after about 10 minutes.  Adding a parallel power
supply makes it go with all 6.

Trent Shipley wrote:
> 
> We are having a terrible time building an array of SCSI disks.  It will
> consist of 10 physical drives, but they will be mirrored--so there will only
> be 5 logical drives.
> 
> We are using an AMI Elite 1600 controller with 37 Gbyte IBM Ultra LVD's
> (SCSI-3).
> 
> What happens is that any attempt to build the array fails when we load
> channel 1 (the second channel) with more than three drives.  (Channel 0 is
> happy with 4 drives.)
> 
> Calls to AMI have resulted in the usual tech-support purgatory.
> 
> We have never gotten to the point where we can install the operating system.
> So far the problem has consumed on the order of ten or twelve man-days with
> little or no progress.  The system is scheduled to ship Monday.
> 
> The problem is exacerbated by the fact that we are a small company, and no
> employee has ever installed more than four drives on a system.  In fact, no
> employee recalls having ever MET anyone who has set up a sizable disk array.
> 
> Free advice will be much appreciated.
>    Offers of fee-for-service advice will be considered.
> 
> Trent Shipley
> 
> Work:
> (602) 522-7502
> mailto:tshipley@symbio-tech.com
> http://www.symbio-tech.com
> 
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-- 
Carpe cerevisiae