Bill,

Were (are) your customers using the 12H as the only drive(s) in the
system or just for the system volumeset?

How much storage did they try sticking in the 12H?  Since you can only
use one FWD interface (currently) on the 12H I would think that you
might also have a FW-SCSI bandwidth problem.

Bill Lancaster wrote:
>
> Hi Donna,
>
> The 12h (AutoRAID) is supported as of 5.5 pp7, it can be used as the system
> volume, and a 9gb drive can be configured as ldev 1 but will only address
> up to 4gb.
>
> The performance implications of the storage system are another story.  As
> with all things performance, "it depends" is again the right answer.  If
> you're planning on using these in a near-line storage capacity (archiving
> etc.) it should be fine.  If you are using it in an OLTP environment with a
> mildly I/O sensitive application, you'll probably still be fine.  If you
> are planning on using it in an OLTP environment with heavy I/O sensitivity
> you may have a problem.
>
> There aren't a huge amount of these installed on MPE systems, but there are
> some.  A few of my customers have them and at least one company is forcing
> a switch from AutoRAID to XP256 just for performance reasons.
>
> Our (Lancaster Consulting's) "official" position is that 1) for MPE always
> configure the 12H as RAID 1 (RAID 5 performance on MPE is awful), 2)
> thoroughly test the 12H in your environment before moving it into
> production, and 3) avoid significant reduction in spindle counts when
> moving to AutoRAID.
>
> HTH,
>
> Bill
>
> At 10:45 AM 3/21/00, Donna Garverick wrote:
> >hi all!
> >
> >(new budget money is a wonderful thing :-)  i'm trying to
> >research the 12h disc array and (of course) i've got some
> >questions.
> >  - is it true that 12h is supported as of 5.5pp7 (plus
> >supplemental patches)?
> >  - and that it can be used for the system volume (including
> >ldev 1)?
> >  - and that ldev 1 can be on a 9gb drive?
> >  - any performance issues?
> >
> >probably enough for today :-)                 - d
> >
> >--
> >Donna Garverick     Sr. System Programmer
> >925-210-6631        [log in to unmask]
> >
> > >>>MY opinions, not Longs Drug Stores'<<<