IBM 5695-DF1 ユーザーズマニュアル
124
Storage Management with DB2 for OS/390
Table 26. Trace Requirement for the I/O Activity Report
s
Figure 47. Buffer Pool Section from I/O Activity Summary Report
11.2 RMF Monitoring
From a DB2 point of view, I/O flows between disk storage and buffer pools. I/O
activity can be modeled as a three-step process involving pathing from hosts to
storage servers, caching of storage server, and internal activity between cache
and physical disk storage. Therefore, to monitor I/O one must ask the following
questions:
activity can be modeled as a three-step process involving pathing from hosts to
storage servers, caching of storage server, and internal activity between cache
and physical disk storage. Therefore, to monitor I/O one must ask the following
questions:
• Which paths do I/Os use, and what is their workload?
• How efficient are the storage server cache algorithms for this workload?
• What is the performance, service time, and/or response time, offered by the
storage server?
I/O Activity Report
DB2 Trace
Class
IFCID
Buffer Pool
Performance
4
6, 7, 8, 9, 10, 105, 107
EDM Pool
Performance
4
29, 30, 105, 107
Active Log
Performance
5
34, 35, 36, 37, 38, 39
Archive Log/BSDS
Performance
5
34, 35, 36, 37, 40, 41,
114, 115, 116, 119, 120
Cross Invalidation
Performance
21
105, 107, 255
BUFFER POOL
TOTALS
AET
----------------------------
-------- ---------
TOTAL I/O REQUESTS
51
0.019885
TOTAL READ I/O REQUESTS
51
0.019885
NON-PREFETCH READS
51
PREFETCH READS
WITHOUT I/O
0
WITH I/O
0
PAGES READ
0
PAGES READ / SUCC READ
0.00
TOTAL WRITE REQUESTS
0
SYNCHRONOUS WRITES
0
N/C
COUPLING FACILITY CASTOUTS
0
N/C
PAGES WRITTEN PER WRITE
0.00
ASYNCHRONOUS WRITES
0
N/C
COUPLING FACILITY CASTOUTS
0
N/C
PAGES WRITTEN PER WRITE
0.00