MIMIX processing of high availability journal performance enhancements - assure_mimix - 10.0

Assure MIMIX Administrator Reference

Product type
Software
Portfolio
Integrate
Product family
Assure
Product
Assure MIMIX™ Software
Version
10.0
Language
English
Product name
Assure MIMIX
Title
Assure MIMIX Administrator Reference
Copyright
2023
First publish date
1999
ft:lastEdition
2024-05-07
ft:lastPublication
2024-05-07T13:36:02.962500

You can enable both journal standby state and journal caching using a combination of MIMIX and IBM commands. For example, the Journal state (JRNSTATE) parameter, available on the IBM command Change Journal (CHGJRN), offers equivalent and complementary function to the MIMIX parameter Target journal state (TGTSTATE).

Note: For purposes of this document, only MIMIX parameters are described in detail.

In a MIMIX environment, two parameters are used to enable journal standby state or journal caching: Target journal state (TGTSTATE) and Journal caching (JRNCACHE). When creating a new journal definition, these parameters can be specified on either the Create Journal Definition (CRTJRNDFN) command or the Change Journal Definition (CHGJRNDFN) command. See Creating a journal definition, Configuring journal standby state, and Configuring journal caching.

When journaling is used on the target system, the TGTSTATE parameter specifies the requested status of the target journal. Valid values for the TGTSTATE parameter are *ACTIVE and *STANDBY. When *ACTIVE is specified and the data group associated with the journal definition is journaled on the target system (JRNTGT(*YES)), the target journal state is set to active when the data group is started. When *STANDBY is specified, objects are journaled on the target system, but most journal entries are prevented from being deposited into the target journal.

The JRNCACHE parameter specifies whether the system should cache journal entries in main storage before writing them to disk. Valid values for the JRNCACHE parameter are *TGT, *BOTH, *NONE, or *SRC. The default value is *NONE which prevents unintentional usage charges.