I did not mean to imply that LDEV 1 should have its own path. What I meant
to imply is that MPEXL_SYSTEM_VOLUME_SET should be on the single path.
Please forgive any misunderstanding my words may have caused.

EMC does not support anything other than RAID-1 for the boot path devices.
This is a policy not a limitation. This does not mean RAID-S or RAID-5 won't
work or that performance degradation will occur. I believe this policy,
which predates my coming to EMC, is done as matter of prudence not
performance.

The opinions expressed herein are my own and not necessarily those of my
employer.
Yosef Rosenblatt


-----Original Message-----
From: PAUL,GUY (HP-Boise,ex1) [mailto:[log in to unmask]]
Sent: Tuesday, August 14, 2001 2:10 PM
To: rosenblatt, joseph; [log in to unmask]
Subject: RE: Configuration suggestions for a Summetrix storage array


I concur with 'Mr. Constantino' as well. Very good descriptions and advice.
RAID-1 is the key for performance although RAID-S (EMC's version of RAID-5)
is suitable for non-io intensive applications.

The ldev 1 boot path does not have to be standalone and is HP supported for
up
to three ldevs on the boot path.

I would also point out that the XP disk frames do not have the RAID-1 or 3
ldev
limitations on the boot path. RAID-5 works extremely well for us and has
given us
excellent performance.

The opinions expressed herein are my own and not necessarily those of my
employer.

Guy Paul
MPE Support Enginneer - HP

-----Original Message-----
From: rosenblatt, joseph [mailto:[log in to unmask]]
Sent: Friday, August 10, 2001 13:04
To: [log in to unmask]
Subject: Re: Configuration suggestions for a Summetrix storage array


Mr. Constantino's advice is excellent. I would just like to add that not
only is Raid 1 recommended it is required if the boot disc is on the
Symmetrix. The boot path should also be configured to stand alone to
minimize contention.

Testing HAFO on Symmetrix is our next project here at EMC. I will keep
everyone informed.

The opinions expressed herein are my own and not necessarily those of my
employer.
Yosef Rosenblatt

* To join/leave the list, search archives, change list settings, *
* etc., please visit http://raven.utc.edu/archives/hp3000-l.html *

* To join/leave the list, search archives, change list settings, *
* etc., please visit http://raven.utc.edu/archives/hp3000-l.html *