Re: WrkSysSts -- MIDRANGE-L

My understanding is you cannot have drives of a different type in the same raid 
set.  Drive 1 can participate in a raid set, but is not stripped, therefor 
shows all of the available disk.  If drive 1 was mirrored you would see two 
drives labeled as drive 1 and no drive 2.  That was how our 510 was configured, 
drive 1 mirrored to drive 2, drives 3-18 in two raid sets, all in the system 
ASP.  Under 4.x you can add the load source into a raid set.  

If I remember the original post correctly, the user just added three more 
drives.  I also remember, but not sure, that you must have at least 4 drives to 
define a raid set and no more than 10 drive can be in one set.

I would also add that a user ASP can overflow into the system ASP, but the 
system ASP canNOT overflow into a user ASP.  I doubt that they have more than 
one ASP defined.  

Christopher K. Bipes             Mailto:chrisb@cross-check.com
Senior Programmer/Analyst  Http://www.cross-check.com
CrossCheck, Inc.                  707 586-0551 x 1102
6119 State Farm Drive          707 586-1884  FAX
Rohnert Park, CA  94928

----- Original Message ----- 
From: <pytel@us.ibm.com>
To: <MIDRANGE-L@midrange.com>
Sent: Thursday, September 07, 2000 7:09 PM
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



+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---

+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---