NetWorker 19.7 Snapshot Management Integration Guide

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Application Information variables for VMAX arrays

The following table lists Application Information variables that NSM can use for VMAX storage arrays.

NOTE The variables in the following table are not relevant for ProtectPoint, unless specifically noted.

Table 1. Application Information variables for VMAX arrays
VMAX variable	Definition
NSR_PS_SYMM_IP	Valid values are TRUE and FALSE. The default value is TRUE. FALSE prevents the use of intelligent pairing and causes NSM to use only the symm.res file.
NSR_PS_TERMINATE_SRC_MIRRORS	Valid values are TRUE and FALSE. The default value is FALSE. You can use a source LUN for either snapvx or bcv/clone/vpsnap, not both. If you specify snapvx for a source LUN which has an existing bcv/clone/vpsnap mirror, the backup will fail. Set this attribute to TRUE to make NSM first terminate the bcv/clone/vpsnap mirror relationship with the source LUN, and then perform a SnapVX snapshot.
NSM_SNAP_SG	Valid value must be a valid VMAX storage group.
SYMM_CLONE_FULL_COPY	Valid values are TRUE and FALSE: TRUE—NSM performs a full data copy of a source LUN. FALSE—NSM places the target in COW (CopyOnWrite) mode and will not perform a full data copy. The default value is TRUE. Notes Notes In a single backup/restore session, NSM can use a BCV as a mirror or a clone, but not both. NSM does not allow a rollback operation for a snapshot taken when this variable is FALSE. An attempted rollback will fail.
SYMM_EXISTING_PIT	Valid values are TRUE and FALSE. The default value is FALSE. Specifies the state of targets for the symm.res file. Set to TRUE to prefer a target LUN that is in SPLIT state with the source LUN.
SYMM_IP_TAKE_UNPAIRED	Valid values are TRUE and FALSE: If set to TRUE, intelligent pairing can reuse old, expired mirrors in the NsrSnapSG group that have a relationship to another LUN. Intelligent pairing terminates the old relationship and then pairs the mirror with the new source LUN. Also, intelligent pairing can pair new, unassociated devices in NsrSnapSG to the source LUN. If set to FALSE, intelligent pairing can select only an available mirror from the devices already paired to the source LUN. The default value is TRUE. Used by intelligent pairing when NSM cannot use any of the mirrors currently paired with the source LUN.
SYMM_ON_DELETE	The default value is RETAIN_RESOURCE. Specifies the state of the mirror device after a backup. These settings are valid only for BCV, VP Snap, and Clone mirrors with SYMM_CLONE_FULL_COPY=TRUE. For VDEV and Clone mirrors with SYMM_CLONE_FULL_COPY=FALSE, NSM always terminates the relationship: RETAIN_RESOURCE—NSM resynchronizes the mirror again with the source when it deletes the snapshot. RELEASE_RESOURCE—NSM leaves the mirror in a split state. This setting is recommended with manual backups or when mirrors are frequently rotated (used with a different source). START_STATE—NSM leaves the target mirror in the same state (split or synced) as before the backup.
SYMM_RB_OVERRIDE_OTHER_TGTS	Valid values are TRUE and FALSE: FALSE—NSM fails the rollback if any other mirrors are in the synchronized state with the source device. TRUE—Before a rollback operation, NSM splits all synchronized mirrors and then resynchronizes them on completion of a rollback. The default value is FALSE. Notes: Ensure that the mirror and the source devices are in a synchronized state when using this variable. The status must not be syncInProg or splitInProg. The InProg status will lead to the loss of the snapshot after a rollback attempt. The InProg status may not occur. If a sync/split of mirror pairs is manual before a rollback, you must wait until the sync/split completion.
SYMM_RES_USE_POLICY	The default value is ANY. EXISTING—NSM seeks a resource that is synchronized with the source device. This setting reduces the backup time. FREE—NSM seeks a resource that is not synchronized with any device. The resource must be in a split or not paired state. ANY—NSM seeks any existing resource first. If NSM finds none, it uses a FREE resource.
SYMM_SNAP_POOL	The default value is C:\programFiles\EMC networker \Nsr\res\symm.res. Defines the pathname of the symm.res file.
SYMM_SNAP_REMOTE	Valid values are TRUE and FALSE. The default value is FALSE. Set to TRUE if using SRDF. Set to FALSE if not using SRDF.
SYMM_SNAP_TECH	Valid values are SNAP, BCV, CLONE, VPSNAP, R2, and SNAPVX. Defines the type of mirroring to use. If set to R2, then SYMM_SNAP_REMOTE must be TRUE or the backup will fail.