Table 1 shows two things:
- The storage capacity of various types of devices presented as
MBTYPES/VOLUME, BTYES/TRACK, and TRACKS/VOLUME.
- How JES2 assigns SPOOL devices based on each device's characteristics
and where the SPOOLDEF initialization statement parameters have been
set with TGSIZE=30 and BUFSIZE=3992. The values in the table represent
what JES2 uses in calculating the available SPOOL Device storage.
For example:
- JES2 uses BUFFERS per TRACK of 10 for either 3380s or 9340s and
uses a BUFFERS per TRACK GROUP of 30.
- JES2 uses BUFFERS per TRACK of 12 for 3390s and sets the BUFFERS
per TRACK GROUP to 36.
- For a mixture of devices (3380s, 9340s, and 3390s), JES2 starts
with TGSIZE=30 and makes the appropriate adjustments for each device
types (that is, 3380s and 9340s get 30 BUFFERS/TRACK GROUP and 3390s
get 36 BUFFERS/TRACK GROUP).
When you have identified the device types for use as SPOOL devices
and have set your SPOOLDEF initialization statements, you use this
table to identify how JES2 utilizes these devices and how JES2 allows
for their storage limitations.
Table 1. Calculated values for
several DASDsDevice attribute |
Spool device type characteristics |
---|
3380 |
3380E |
3380K |
3390-1 |
3390-2 |
3390-3 |
9340-1 |
9340-2 |
---|
MBYTES/VOLUME |
630 |
1260 |
1890 |
946 |
1892 |
2838 |
1003 |
1502 |
BYTES/TRACK |
47476 |
47476 |
47476 |
56664 |
56664 |
56664 |
46456 |
46456 |
TRACKS/VOLUME |
13275 |
26550 |
39825 |
16695 |
33390 |
50085 |
21600 |
32340 |
Note: Characteristics of 3390 Model 2. For 3390 Model 1 capacities, divide
the volume characteristics by 2.
|
Table 2. Calculated values
for several DASDs - BUFSIZE and TGSIZEDevice attribute
values (BUFSIZE=3992, TGSIZE=30) |
Spool device type characteristics |
---|
3380 |
3380E |
3380K |
3390-1 |
3390-2 |
3390-3 |
9340-1 |
9340-2 |
---|
BUFFERS/TRACK |
10 |
10 |
10 |
12 |
12 |
12 |
10 |
10 |
TRKCELL |
4,5 |
4,5 |
4,5 |
3,4,6 |
3,4,6 |
3,4,6 |
4,5 |
4,5 |
TRACKS /TRACK GROUP |
3 |
3 |
3 |
3 |
3 |
3 |
3 |
3 |
BUFFERS /TRACK GROUP |
30 |
30 |
30 |
36 |
36 |
36 |
30 |
30 |
KBYTES /TRACK GROUP |
120 |
120 |
120 |
144 |
144 |
144 |
120 |
120 |
TRACK GROUPS /VOLUME |
4425 |
8850 |
13275 |
5565 |
11130 |
16695 |
7200 |
10780 |
Usable MBYTES/VOLUME |
530 |
1060 |
1590 |
800 |
1600 |
2400 |
862 |
1291 |
Device Utilization(%) |
84 |
84 |
84 |
85 |
85 |
85 |
85.9 |
85.9 |
Note: Characteristics of 3390 Model 2. For 3390 Model 1 capacities, divide
the volume characteristics by 2.
|
Table 3 provides device utilization
percentages for selected DASD based on several JES2 initialization
parameter BUFSIZE specifications.
The 3390-9 is supported for SPOOL. See Specifying the storage of checkpoints on DASD for information on using the SPACE= parameter.
Table 3. Selected device and
BUFSIZE parameter (on SPOOLDEF) values and resultant utilization percentagesUTILIZATION (%) |
---|
DASD |
BYTES /TRACK* |
BUFSIZE |
BUFFERS /TRACK |
DEVICE** |
STORAGE*** |
---|
3380 |
47476 |
3992 |
10 |
84 |
97 |
3856 |
11 |
89 |
94 |
1944 |
19 |
78 |
95 |
3390 |
56664 |
3992 |
12 |
85 |
97 |
3856 |
12 |
82 |
94 |
3768 |
13 |
86 |
92 |
1944 |
22 |
76 |
95 |
9340 |
46456 |
3992 |
10 |
85.9 |
97 |
3672 |
11 |
89.6 |
65 |
1944 |
18 |
75.3 |
95 |
- *
- Values presented as “Maximum Block Size Per Track” in MVS/DFP
Managing non-VSAM Data Sets
- **
- Device Utilization % = BUFSIZE x buffers/track bytes/track
- ***
- Storage Utilization % = BUFSIZE x buffers/page bytes/page
(= 4096)
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