NetWorker 19.7 Snapshot Management Integration Guide

Configuring the symm.res file

The default location of the symm.res file is /nsr/res/symm.res. You can specify an alternate location by using the Application Information variable SYMM_SNAP_POOL=pathname.

The file consists of one or more lines, each in the following format:

vmax_id:source_dev_id [vmax_id:]mirror_dev_id1 [vmax_id:]mirror_dev_id2

When you specify one or more mirror LUNs for a single source LUN, NetWorker pairs the best mirror LUN with the source LUN. If NetWorker cannot find a pair, the backup fails with the following message:

Not enough resources.

NetWorker ignores blank lines in the symm.res file and lines starting with #.

The vmax_id for the source LUN is mandatory. If the selected mirror LUN does not have a VMAX-id, the mirror LUN uses the VMAX-id of the source LUN.

For SRDF configurations, the vmax_id of the mirror LUNs is mandatory and must be different from the vmax_id of the source LUN.

For example, a simple symm.res file for a source LUN ABC with 3 mirror LUNs 123, 456, and 789 can be as follows:

# LUNs for /critical_filesystem
000194901248:ABC 123 456 789

For an SRDF configuration, the same symm.res file could be as follows:

000194901248:ABC 0001949017BA:123 0001949017BA:456 0001949017BA:789