Use this command to update the control information with new target values
for either cache or lock space.
- For cache space, specify record slot allocation ratios for either
3880 record cache (RC) or 3990 record cache subsystem (RCS) control units in
the complex.
- For lock space, specify the number of locks for the concurrency
filter lock facility (CFLF).
Requirements and Restrictions
- This message only updates system control information with the
desired allocation ratio values. Enter the ZBUFC ALLOCATE IMPLEMNT
command to actually apply the pending changes for the specified
record cache control units in the complex.
- In order to use the 3880 RC and 3990 RCS control units, you must partition
subsystem storage so that it can use record and track (or buffer) slots in the
cache storage.
Format
- RC381
- changes the record slot allocation for 381-byte records for 3880 RC
control units.
- RC1055
- changes the record slot allocation for 1055-byte records for 3880 RC
control units.
- RC4096
- changes the record slot allocation for 4096-byte (4-KB) records for 3880
RC control units.
- ratio
- is a decimal ratio value from 1-255 for the record slot
allocation.
- RCBUF-count
- changes the buffer counts for the 3880 record cache subsystem, where
count is a decimal buffer count value from 1-16.
- INIT
- initializes the current and target allocation values of the record cache
subsystem status table (SSST).
- Note:
- You can specify this parameter only when you are prompted during
restart.
- RCS381
- changes the record slot allocation for 381-byte records for 3990 RCS
control units.
- RCS1055
- changes the record slot allocation for 1055-byte records for 3990 RCS
control units.
- RCS4096
- changes the record slot allocation for 4096-byte (4-KB) records for 3990
RCS control units.
- RCSBUF
- changes the buffer counts for the 3990 record cache subsystem.
- pp
- is a percentage from 0-95%.
- Note:
- For the RCSBUF parameter, you can specify a percentage value from
5-25%.
- Locks-num
- changes the number of lock groups that are allocated, where
number is a decimal number from 1-64.
- Note:
- Locks are allocated in groups of 256. For example, LOCKS-1 allocates
256 locks and LOCKS-2 allocates 512 locks.
Additional Information
- Online help information is available for this command. To display
the help information, enter one of the following:
ZBUFC HELP
ZBUFC ?
- If you omit any RC ratio value, the current ratio value retained by the
TPF system is used for that record size.
- Do not define RC ratio values as 0 unless you intend to run the control
unit in direct mode.
- For RCS allocations, the percentage values that you enter must total
100%.
- You can specify an equal sign (=) instead of the dash (-) for the
parameters in this command.
- Processing for this command differs for the 3990 Model 3 and the IBM
Enterprise Storage Server (ESS). See TPF Database
Reference for more information about these processing
differences.
Examples
The target allocation ratios used to partition 3880 RC control units are
defined in the following example.
+--------------------------------------------------------------------------------+
|User: ZBUFC ALLOC RC381-09 RC1055-08 RC4096-07 RCBUF-03 |
| |
|System: BUFC0037I 07.48.38 ALLOCATE - CACHE ALLOCATION PENDING |
+--------------------------------------------------------------------------------+
The target allocation ratios used to partition 3990 RCS control units are
defined in the following example.
+--------------------------------------------------------------------------------+
|User: ZBUFC ALLOC RCS381-25 RCS1055-30 RCS4096-20 RCSBUF-25 |
| |
|System: BUFC0037I 07.49.23 ALLOCATE - CACHE ALLOCATION PENDING |
+--------------------------------------------------------------------------------+
Related Information
See the following for more information about record caching:
- TPF Database Reference
- 3880 Storage Control Record Cache RPQ
Introduction
- 3880 Storage Control Record Cache RPQ
Description
- 3990 Storage Control Planning, Installation, and
Storage Administration
- 3990 Storage Control Operations and Recovery
Guide
- 3990 Transaction Processing Facility Support
RPQs.