Chapter 2: Mirroring Database Devices

Effects on system tables

The mode option changes the status column in sysdevices to indicate that mirroring has been disabled (see Table 7-2 on page 254). Its effects on the phyname and mirrorname columns in sysdevices depend on the side argument also, as shown in Table 2-1.

**Table 2-1: Effects of mode and side options to the disk mirror command**
		side
		primary	secondary
mode	remove	Name in mirrorname moved to phyname and mirrorname set to null; status changed	Name in mirrorname removed; status changed
	retain	Names unchanged; status changed to indicate which device is being deactivated

This example suspends the operation of the primary device:

disk unmirror 
  name = "tranlog", 
  side = "primary"

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