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March 2003, Week 3

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Subject:
Re: OT: Volume sets on MPE
From:
Denys Beauchemin <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Tue, 18 Mar 2003 12:58:31 -0600
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Does the system crash is a non-MPEXL_SYSTEM_VOLUME_SET volume fail?

Denys

-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On Behalf Of Paveza, Gary
Sent: Tuesday, March 18, 2003 12:55 PM
To: [log in to unmask]
Subject: Re: OT: Volume sets on MPE

Biggest benefit.

You cannot mirror your system volume set.

If you lose a disk on the system volume set your system is down and requires
a reload.
If you lose a disk on the user volume set, you only reload that one.
---------------------------------------------------------
Gary Paveza, Jr.
Senior Systems Administrator
(302) 252-4831 - phone
(302) 377-1516 - cell

        -----Original Message-----
        From:   Denys Beauchemin [SMTP:[log in to unmask]]
        Sent:   Tuesday, March 18, 2003 1:46 PM
        To:     [log in to unmask]
        Subject:        [HP3000-L] OT: Volume sets on MPE

        I apologize for the on-topic post.

        I recently had occasion to chat with an MPE site that has many disk
drives in a single volumeset, MPEXL_SYSTEM_VOLUME_SET.

        I suggested they might want to break up the storage, which is on a
dozen or more disk drives, (no arrays,) into two or more volume
        sets.  I suggested using about 4 of the smaller disks for MPEXL...
and to put the bigger ones together in another volume set.

        Several years ago (12+years) I gave a paper on volume sets and the
benefits of using them.  I mentioned increased system resiliency,
        enhanced system performance and easier management.

        I have two questions:
        1- Is the performance boost still valid in 7.5?  I believe the
checkpointing algorithm has somewhat changed in the last 12 years.
        2- Are there other benefits for using multiple volume sets that I
might have missed?


        Denys

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