we have on our biggest HP3000 (995-800) 9 * 2.7 GB Discarrays for the
Sys_Vol,
and 2 * 50 * 2 GB F/W SCSI discs mirrored in five private volume sets.
Disc I/O bottlenecks were solved by exchanging the old 2.7, 4.0, and 5.4 GB
Discarrays by these small disks and
adequate number of Interface cards (max 6 disks on one card; HP recs. max
10).
So far (since one year) we didn't experience any problem in mirroring. Only
on-line backup (5.0) very seldom couldn't store all files because of open
failures. Some H/W disc problems didn't affect the system ... discs are
really hot plugable!
In my point of view, go for small disks, and don't use the limits of the
cards. Mirroring is a very good solution!
Best regards, Andreas Schmidt, CSC
bob_mueller @ DATASCOPE.COM
09/23/97 05:22 PM
Please respond to [log in to unmask]
To: HP3000-L @ RAVEN.UTC.EDU
cc: (bcc: Andreas Schmidt/HI/CSC)
Subject: Protection from Disk Failure
As they say on the radio... "Long time listener, first time caller",
or in this case "Writer".
I'm looking at ways to increase protection on my disk "Farm" in case
of a disk-crash. Currently on a HP3000/957SX, I have about 18GB, on 10
drives, in 1 volume-set. Of the 18GB, about 13GB is used (28% free
space), of the 13GB, only 3.5GB is user data. The rest is source-code,
executables, etc., and 2 copies of the user data. All of the user data
is in Image databases (ASK/MANMAN System)
My primary concern is losing user data that has been entered during
the day, before the nightly back-up. We are a manufacturing facility,
so although downtime is a concern, the loss of data is most critical.
One given is to set up User Volume Sets (SYSTEM, PRODUCTION, TEST).
I'm looking for some feedback from the list about any concerns or
problems in using Mirrored Disk. With adding 4 more disk drives, I can
set up the following configuration:
System: 2 drives
Production: 4 drives
Prod Mirrored: 4 drives
Test & other 4 drives
My concern is the possibility of an I/O bottleneck by bringing the
production data down to 4 drives, when it used to be spread over 10.
Thanks in advance for any responses to the above.
Bob Mueller [log in to unmask]
M.I.S. Manager Phone: 201-967-3680
Datascope Corp. - PM Division Fax: 201-265-1867
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