+DRAIN1

The +DRAIN1 parameter controls how processing issues drains during the following stages:

  • Before reorganization. This initial drain establishes a specific point in time.
  • After reorganization but before the final drain. This drain captures and applies changes.

Depending on the option you choose, these final drain, or series of drains, will be either:

  • +DRAIN1(WTR): (Default) Writers only
  • +DRAIN1(ALL): Readers and writers

Related topic

Global-parameters-UTLPARMS

If +DRAIN1(ALL) is used, the job output displays DRAIN(RDW) to distinguish it from the final drain, which is always a DRAIN(ALL).

BMC recommends using +DRAIN1(ALL). The advantages of this option are:

  • Readers that cannot be drained are discovered prior to the reorganization rather than after completion.
  • Draining both readers and writers prevents the deadlock that can occur with +DRAIN1(WTR) and ensures a successful final drain.

DRAIN1.png

The values are defined as follows:

WTR

(Default) Processing waits on writer claims only.

ALL

Processing waits on all (both reader and writer) claims.

Important

For the rules that apply to parameter syntax, see Parameter syntax rules.

 

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