At 06:51 PM 2003-03-24, Craig Lalley wrote:
>Gilles,
>Thanks for the info. But now I am getting conflicting information. Would
>anyone else care to comment?
> Gilles Schipper <[log in to unmask]> wrote:
>
> >Yes, mod20's can be INSTEAD OF software disk mirroring on the HP3000.
> >
> >Better still, you can use mod20's to mirror the MPEXL_SYSTEM_VOLUME_SET -
> >something which cannot be accomplished with MIRROR/iX software.
>
>Great, that is what I would want to do.
>
> >Also, the mod20 permits dual-controller access to the HP3000 - a feature
> >NOT available with the far more expensive Autoraid 12H.
>
>Is this true? I have heard about 3 yes and 3 no's.
Yes, it's true. I have several customers for which I have installed mod20's
that are attached to and configured with 2 FWSCSI controllers on the HP3000.
> >Each mod20 supports a maximum of 8 luns - the same limit as the Autoraid12H.
>
>8 luns, but 20 mirorred disks, hmmm doesn't compute. So are you saying I
>can only have a maximum of 8 disks mirrored on two channels?
Here's the math:
If using ONLY raid 1 (mirroring) you can still effectively use all 20
disks. You would use 16 of them to represent 8 raid 1 (mirrored) luns, 2
hot spares and 2 cold spares. The spares use up no luns.
However, by utilizing raid5 luns, you could use all 20 disks even without
spares.
And, you can mix raid 1 luns with raid 5 luns in the same mod20.
(Incidentally, for performance reasons, I would stay away from raid5 use,
unless limited to use for archival, read-only type of data.)
> >In a nutshell, I highly recommend the nike mod20 disk array.
> >
> >I suggest dual Storage Processors (SP's) and maximum memory (which,
> >officially is 64mb per SP, but 128mb per SP works just fine.
>
>Has anyone else done this? This could be the reason why Larry couldn't
>get it to work.
For me, the proof is in the pudding.
I have at least 2 customers using 128MB SP's with no problems.
If you have the impression that I like the mod20, you would be absolutely
correct.
>Thanks in advance.
>
>-Craig
>
>
>
>
>
>
>---------------------------------
>Do you Yahoo!?
>Yahoo! Platinum - Watch CBS' NCAA March Madness, live on your desktop!
>
>* To join/leave the list, search archives, change list settings, *
>* etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
-------------------------------------------------------------------------------------------------
Gilles Schipper
GSA Inc.
HP System Administration Specialists
300 John Street, Box 87651 Thornhill, ON Canada L3T 7R4
Voice: 905.889.3000 Fax: 905.889.3001
email: [log in to unmask] web: http://www.gsainc.com
-------------------------------------------------------------------------------------------------
* To join/leave the list, search archives, change list settings, *
* etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
|
