Metro Mirror and Global Mirror Failover/Failback with Practice session properties

The properties are displayed on different tabs in the notebook. Use the Session Options tab to set properties that apply to the entire session. Use the H2-I2 Options tab to set properties that apply to the role pair.

Session Options

Enter the properties for the session.

Description

Type the description for this session.

H2-I2 Options

Enable automatic restart on unexpected suspends

When you select this option, the Copy Services Manager server automatically restarts the session when it unexpectedly suspends due to reason code 1720 or 1920. An automatic restart is attempted for every suspend with reason code 1720 or 1920 up to a predefined number of times within a 30-minute time period. The number of times that a restart is attempted is determined by the storage server gmlinktolerance value. If the number of allowable automatic restarts is exceeded within the time period, the session does not restart automatically on the next unexpected suspend. Issue a Start command to restart the session, clear the automatic restart counters, and enable automatic restarts.

Warning: When you enable this option, the session is automatically restarted by the server. When this situation occurs, the secondary site is not consistent until the relationships are fully resynched.

Delay time before restart (seconds)

Specify the amount of time (in seconds) in which the copy services management server waits after an unexpected suspend, before automatically restarting the session. The range of possible values is 0 - 43200. The default is 0, which specifies that the session is restarted immediately following an unexpected suspend.

Enter the properties for the role pair.

Incremental

Select this option to set up the relationship for recording changes to the practice volume (H2). All subsequent FlashCopy® operations between the intermediate volume and the host volume copy only the data that changed since the previous FlashCopy operation.

Background Copy Rate for H2-I2

Type the copy rate that the storage system uses to perform the background copy of the FlashCopy role pair.

Note: For older storage systems running IBM Spectrum Virtualize, you can specify a value in the range of 0-100. For newer storage systems at release 7.8.1 and higher, you can specify a value in the range of 0-150. The default rate is 50.

Specify 0 if you do not want the hardware to write the background copy until the source track is written to. Data is not copied to the target volume until the blocks or tracks of the source volume are modified.

You can modify this value at any time during the session. If the session is performing a background copy when you change the option, IBM® Copy Services Manager immediately modifies the background copy rate of the consistency group on the storage system. The storage system consistency group immediately starts by using this new rate to complete the background copy.