Setting up the SMSPDSE1 address space

Before you begin: Your system already has the nonrestartable SMSPDSE address space. The restartable PDSE address space (SMSPDSE1) is optional and available only for systems that use PDSESHARING(EXTENDED). If you decide to start SMSPDSE1, there are two PDSE address spaces in the system.

The nonrestartable SMSPDSE address space is used for PDSEs that are contained in the LNKLIST.
The restartable SMSPDSE1 address space is used for all other PDSEs in the system.

Perform the following steps to set up the SMSPDSE1 address space:

Specify PDSESHARING(EXTENDED) in the IGDSMSxx parmlib member.
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Example:

PDSESHARING(EXTENDED)
Specify PDSE_RESTARTABLE_AS(YES) in the IGDSMSxx parmlib member.
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Optionally, specify the values for the following IGDSMSxx parmlib parameters to tune the SMSPDSE1 address space:
- PDSE1_LRUCYCLES
- PDSE1_LRUTIME
- PDSE1_HSP_SIZE
- PDSE1_BMFTIME
- PDSE1_MONITOR
Example:
```
PDSE_RESTARTABLE_AS(YES)
PDSE1_MONITOR(YES)
PDSE1_LRUCYCLES(200)
PDSE1_LRUTIME(50)
PDSE1_HSP_SIZE(256)
PDSE1_BMFTIME(3600)
```
This example brings up the SMSPDSE1 address space with the monitor turned on. The SMSPDSE1 address space uses a hiperspace of 256 MB for caching PDSE member caching. SMS waits 3600 seconds before recording SMF records for BMF caching for the SMSPDSE1 address space. The BMF waits 200 cycles before reusing inactive buffers and 50 seconds before calling the BMF data space cache. Monitor the SMF 42 type 1 record to determine the amount of caching activity in the BMF data space and tune the PDSE1 parameters.

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Optionally, specify the values for the following IGDSMSxx parmlib parameters to tune the nonrestartable SMSPDSE address space:
- PDSE_LRUCYCLES
- PDSE_LRUTIME
- PDSE_HSP_SIZE
- PDSE_BMFTIME
- PDSE_MONITOR
Example:
```
PDSE_MONITOR(YES)
PDSE_LRUCYCLES(250)
PDSE_LRUTIME(15)
PDSE_HSP_SIZE(256)
PDSE_BMFTIME(3600)
```
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IPL the z/OS system to create the SMSPDSE and SMSPDSE1 address spaces.
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To verify that both the SMSPDSE and SMSPDSE1 address spaces exists after you IPL z/OS, issue the following commands:

Example:

D A,SMSPDSE
D A,SMSPDSE1