Allowing functions to release ARCENQG and ARCCAT or ARCGPA and ARCCAT for CDS backup to continue

Certain functions and modules enqueue ARCENQG and ARCCAT or ARCGPA and ARCCAT resources during processing. When these resources are held, CDS backup cannot continue. Table 1 lists the external interface (patch) that can be enabled or tuned to set an interval at which the function or module is forced to release the resources.

When a patch is used, the function or module is quiesced and the resource is released. After the set interval, a hold on the resource is obtained again. These patches are not applicable for every action of the function or module. For example, the auditing 500 data set interval is not applicable for audit functions that do not process data sets.

Table 1. Functions and the Patch Used to Control the Release Interval to Allow CDS Backup to Continue
Function or module	Resource released	Default interval	External interface (patch)
Recycle	ARCGPA, ARCCAT	15 minutes	`PATCH.YGCB.+CE X'nn'`
Audit	ARCGPA, ARCCAT	500 data sets	`PATCH.MCVT.+25C X'nn'`
TAPECOPY	ARCGPA, ARCCAT	10,000 blocks	`PATCH.MCVT.+286 BITS(........1.)`
Migration (secondary space management)	ARCGPA, ARCCAT	5 minutes (TIME default)	`PATCH.MGCB.+B2 X'nn'`
Migration (primary space management, interval migration, on-demand migration, and command migration)	ARCENQG, ARCCAT	0 minutes (TIME default)	`PATCH.MGCB.+90 X'nn'`
EXPIREBV	ARCGPA, ARCCAT	500 data sets	`PATCH.MCVT.+25C X'nn'`
Tape device allocation (migration)	ARCGPA, ARCCAT	10 seconds	`PATCH.MCVT.+194 BIT(.......1)`
Note: These patches to not have an effect on releasing the ARCCAT resource under normal operation of the function or module. However, if an error occurs that prevents the function or module from releasing ARCCAT when a CDS backup is initiated, the patch value will apply. X'nn' is the hexadecimal representation of the interval (minutes or data sets) for which the resource is released. For both migration patches (in both a non-RLS and RLS environment), when work is completed on the current data set, a check is performed to determine whether the number of minutes specified in the patch has passed. If the number of minutes has passed, the resource is released so that other functions (such as CDS backup) that need the resource are able to continue. For both migration patches (in an RLS environment), when work is completed on the current data set, an additional check is performed to determine whether any other host is waiting for the resource to be available before starting a CDS backup. If a host is waiting for the resource, the resource is released.