On 6/18/2016 11:03 AM, Jake Anderson wrote:
Is there a way to know if the DD chain has approached the end or it has approached the end of Chain. Is there a way to tweak the JCL to overcome TIOT exceeded values ?
The TIOT is a fixed sized array of entries, not a chain. The size is defined in PARMLIB member ALLOCxx, with a maximum allowed size of 64K. Only when an allocation request fails due to insufficient TIOT space do you know it is full.
The primary 'tweak' for SMS managed datasets that can reduce the space used for each DD in the TIOT is to reduce the dynamic volume count (DYNVOL) specification defined for the data class (http://www-01.ibm.com/support/docview.wss?uid=isg3T1000065).
It is possible to dynamically allocated datasets using the extended TIOT (aka, XTIOT). This requires the application be updated appropriately (http://publibz.boulder.ibm.com/zoslib/pdf/oa34634.pdf). For non-VSAM datasets you must also change PARMLIB member DEVSUPxx to specify NON_VSAM_XTIOT=YES. VSAM datasets may be allocated using the XTIOT without any changes to PARMLIB.
Greg ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
