ADSM-L

Roll Forward Mode

2001-04-17 11:23:26
Subject: Roll Forward Mode
From: "Gill, Geoffrey L." <GEOFFREY.L.GILL AT SAIC DOT COM>
Date: Tue, 17 Apr 2001 08:07:11 -0700
Here is a little of my environment that might help answer this question:
TSM 4.1.2
AIX 4.3.3
3494lib with 4 3590-E1A's

Database:

          Available Space (MB): 18,000
        Assigned Capacity (MB): 18,000
        Maximum Extension (MB): 0
        Maximum Reduction (MB): 8,740
             Page Size (bytes): 4,096
            Total Usable Pages: 4,608,000
                    Used Pages: 2,356,088
                      Pct Util: 51.1
                 Max. Pct Util: 51.5
              Physical Volumes: 6
             Buffer Pool Pages: 32,768
         Total Buffer Requests: 188,336,528
                Cache Hit Pct.: 98.12          (BufPoolSize        131072)
               Cache Wait Pct.: 0.00
           Backup in Progress?: No
    Type of Backup In Progress:
  Incrementals Since Last Full: 0
Changed Since Last Backup (MB): 621.21
            Percentage Changed: 6.75
Last Complete Backup Date/Time: 04/16/01 11:16:22

Log:
       Available Space (MB): 2,000
     Assigned Capacity (MB): 2,000
     Maximum Extension (MB): 0
     Maximum Reduction (MB): 1,996
          Page Size (bytes): 4,096
         Total Usable Pages: 511,488
                 Used Pages: 279
                   Pct Util: 0.1
              Max. Pct Util: 89.3
           Physical Volumes: 4
             Log Pool Pages: 2,048
         Log Pool Pct. Util: 0.18
         Log Pool Pct. Wait: 0.00
Cumulative Consumption (MB): 409,183.96
Consumption Reset Date/Time: 09/27/99 13:00:44

I want to switch to roll forward mode but am not sure if the log size is
sufficient. Does anyone have any experience with switching in mid stream? I
have about 120 clients, I do have a space trigger set for both the DB and
log.

I'd also like to know if anyone thinks my (BufPoolSize        131072) is a
bit low. I discovered my cache hit was down below 97% last week so I reset
the buffer pool and it creeped up to just over 98%. Would increasing this
help? Do I need to consider my total server memory before I increase this?

Thanks for all the help,

Geoff Gill
TSM Administrator
NT Systems Support Engineer
SAIC
E-Mail:   gillg AT saic DOT com
Phone:  (858) 826-4062
Pager:   (888) 997-9614
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