RE: WrkSysSts -- MIDRANGE-L

Your explanation also fits the facts, we'll have to wait for the original
poster to tell us if the machine has 9 or 10 drives and confirm mirroring on
drive 1.  We could also ask for a performance tools component report or get
a quick performance tools run and run some SQL or Query or whatever over the
QAPMDISK file.

RAID configs with from 4 to 10 drives are possible.  If the RAID set
contains 4, 5, 6, or 7 drives, the parity data is placed on 4 drives and, if
present, drives 5, 6, and 7 show as full sized.  If the RAID set contain 8
or 9 or 10 drives, the parity data is placed on 8 drives and drives 9 and
10, if present, show as full sized.

Drive 6 is in a RAID set else it would show up as full sized.  It cannot be
in the RAID set with the 4 GB drives since all drives in a RAID set must be
the same size.  Four drives are the minimum for a RAID set and 6 through 9
all are reduced in size for parity data.  Therefore drive 6 is in a 4-drive
RAID set consisting of drives 6 through 9.  If there aren't any other odd
bits of information, then drive 6 is in ASP 1 with all the 4 GB disk arms
and drives 7 through 9 are in ASP 2.  Why would anyone arrange the disk on a
small system like this?

Finally, what filled up ASP 1?  Aside from RTVDSKINF, can you think of a way
beside SMTRACE to figure out what is in there?  With the drives more than 99
percent full, is there enough room to run RTVDSKINF?

Richard Jackson
mailto:richardjackson@richardjackson.net
http://www.richardjacksonltd.com
Voice: 1 (303) 808-8058
Fax:   1 (303) 663-4325

-----Original Message-----
From: owner-midrange-l@midrange.com
[mailto:owner-midrange-l@midrange.com]On Behalf Of pytel@us.ibm.com
Sent: Thursday, September 07, 2000 8:09 PM
To: MIDRANGE-L@midrange.com
Subject: RE: WrkSysSts



> Drive 1 is full size.  Drives 2-5 have reduced sizes like they are in a
RAID
> set.

I guess unit 1 is mirrored drive. We do not see mirrored pair, because it
has the same unit number and WRKDSKSTS does not show it.

> You cannot divide a RAID set between two ASP, can you?

Yes, you can. This could explain sharp difference in %use and utilization.
If these are two different ASPs then they are properly balanced (within
themselves).
Unit 1 is always somewhat more loaded than others.

My guess this is an older system which could not have load source in a RAID
set.
So what we have is a 10 drive system.
Two drives are mirrored. Other 8 drives are in two RAID sets.
And drives 7, 8 and 9 could be ASP 2.



                             Work with Disk Status
 Elapsed time:   00:06:02

                 Size    %    I/O  Request  Read  Write  Read   Write    %
 Unit  Type      (M)   Used   Rqs  Size (K) Rqs   Rqs    (K)     (K)   Busy
    1    6607    4194  99.9   7.3    8.9    5.4   1.8     7.3    13.6     5
    2    6607    3145  99.9   3.3   12.6    1.7   1.6    20.0     5.1     2
    3    6607    3145  99.9   2.8   14.6    1.6   1.2    19.3     8.4     2
    4    6607    3145  99.9   3.6   11.7    1.9   1.7    16.5     6.1     3
    5    6607    3145  99.9   4.2   11.0    1.8   2.3    18.7     4.8     1
    6    6714   13161  99.1   6.6   11.5    4.4   2.1    13.3     7.7     6
    7    6714   13161  38.8   4.7   19.1    1.2   3.4    27.3    16.2     2
    8    6714   13161  38.8   4.3   18.7    1.9   2.3    21.8    16.2     2
    9    6714   13161  38.8   4.2   20.6    1.5   2.6    26.7    17.1     2



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