Mr. Tracy.
Sorry, I was going to add that.
The MOD20 has 5 SCSI chains, A,B,C,D,E, so it does not go down the middle or up
down. There are 4 drives on each chain 0,1,2,3
Here's a bad attempt at ASCI Art.
0 - A B C D E 1 - A B C D E
2 - A B C D E 3 - A B C D E
The Default SP that controls the binded pair is the one that does the bind.
So, I bind 4 on one SP and 4 and the second SP.
By binding A0,B0 you will be binding across SCSI chains.
Remember the two console ports are seperate consoles!
I have an electronic copy of the Mod20 users manual, it has some pretty good
diagrams.
BTW, someone from HP wanted me to remind you that the MOD 20 does not report to
predictive, so it may be best to have a hot spare.
HTH,
-Craig
--- "Johnson, Tracy" <[log in to unmask]> wrote:
> Thanks.
>
> I still have trouble interpreting the manual.
>
> Are the SCSI controlers divided between a0 and a1
> or between a0 and a2? (in other words, down the
> middle or between the top and bottom?)
>
> The manual doesn't say which is which when using
> RAID-1 and is in error when it refers to figure
> 2-9 when discussing RAID-1/0 (it should mention
> figure 2-10 I think.)
>
> Either way, the diagrams really don't show where
> the SCSI buses are. You get a clue when looking
> at the Model 10 diagram, but that doesn't help
> with Model 20.
>
> Also sometimes the console port locks up. No
> matter how much key-banging with controls,
> escapes, break, reset seems to undo it. Good
> thing there are two console ports.
>
> And who at HP decided to use DEC terminal
> emulation!? This was YEARS before Compaq
> took over DEC and HP took over Compaq!
> (Or was it a long term conspiracy?)
>
> Tracy Johnson
> MSI Schaevitz Sensors
>
> > -----Original Message-----
> > From: Craig Lalley [mailto:[log in to unmask]]
> > Sent: Thursday, January 15, 2004 12:46 AM
> > To: [log in to unmask]
> > Subject: Re: [HP3000-L] Nike Model 20 - Drives Me Nuts
> >
> >
> > Hey Mr. Tracy,
> >
> > I really enjoyed the model 20's. Some interesting
> > information for you.
> >
> > The SP620 controllers use 4 16MB FPM simms, (is 32MB really
> > the limit? :-) )
> >
> > MPEX can only see 8 LUNS.
> >
> > I only recommend Mirroring for MPE, stripping is too much of
> > a performance hit.
> >
> > What I do is mirror a0,b0 c0,d0 e0,a1 etc, that way it will
> > be mirrored across
> > SCSI chains. I HAVE seen a chain go bad in real life, there
> > was no impact to
> > the system.
> >
> > I bind 4 pairs on the first SCSI controller and 4 pairs on
> > the second. 16
> > drives (8 mirrored pairs)is the maximum number of drives for
> > performance.
> >
> > To get to "Field Engineer Mode" on the Grid Manager, do a
> > Control "P", Shift FE
> >
> > For MPE, I find it is best to set the controllers to all
> > write cache, this
> > improves the performance of the transaction manager.
> >
> > If the Mod20 system parameter is set to 2? ~ unix, it will
> > never work on MPE,
> > set it to A.
> >
> > Have fun.
> >
> > -Craig
> >
> >
> > --- Tracy Johnson <[log in to unmask]> wrote:
> > > I have a new Model 20 array and I've been
> > > having fun learning how to bind and unbind
> > > the drives. Seems there are more than
> > > 50 ways ...
> > >
> > > One thing that drives me nuts though, is
> > > no matter how configure the fourth drive
> > > and seventh drives, the HP tells me it is:
> > >
> > > BUSY UNKNOWN
> > >
> > > In DSTAT ALL.
> > >
> > > (This is after doing an INSTALL. I have
> > > a test machine to play with.)
> > >
> > > The next question is trivia:
> > >
> > > Can the bus be split between the two SCSI
> > > ports on the back? Or are the drives
> > > interminably linked? I was thinking I
> > > could configure more LDEVs, but apparently
> > > MPE won't let me go beyond seven mirrored
> > > pairs. The old manual I have only tells
> > > me HP-UX stuff, (I suppose I should look
> > > on the CD rom.)
> > > --
> > > BT
> > > NNNN
> > >
> > >
> > >
> > > Tracy Johnson
> > > Justin Thyme Productions
> > > http://hp3000.empireclassic.com/
> > >
> > > * To join/leave the list, search archives, change list settings, *
> > > * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
> >
> >
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