HP StorageWorks SAN Virtualization Services Platform Manager user guide (5697-0295, January 2010)

2. Select Manage > Manage Presentation > Remove Host Presentation. The Select Host(s) screen
appears. The upper area of the screen displays the hosts to which the sync mirror group is
presented.
3. Select a host and click Add. The host you selected is displayed in the lower area of the screen.
Repeat this step to remove the permission for additional hosts.
4. Click Remove. The host appears in the Hosts table.
5. Click Next. A confirmation screen appears.
6. Click Finish. The host permission is removed from the sync mirror group.
NOTE:
If you remove the permission for the last host that had access to the sync mirror group, then
the host has no DPM assigned to service that sync mirror group. As a result, the sync mirror
group’s status appears as Absent and the status of the sync mirror group’s tasks appears
as Unknown.
In such a case, you must either add permission for at least one host to the sync mirror group
or delete the group.
Clearing persistent reservation for sync mirror groups
In the event that a persistent reservation cannot be cleared by normal means, you can manually clear
the persistent reservation for the holder of the persistent reservation and all registered initiators.
NOTE:
This option is only available when the sync mirror group is reserved and/or has registered initiators.
To clear a persistent reservation for a sync mirror group:
1. Right-click the sync mirror group for which you want to clear the persistent reservation.
2. Select Clear Persistent Reservation. A confirmation screen appears.
3. Click Finish. The persistent reservation is cleared.
Changing the synchronous local mirror group mode
A sync mirror group can operate in either an Always Synchronized mode or Continue-on-Fail mode.
For a description of the two modes, see the explanation in “Synchronous mirroring” on page 292. You
can change a group’s mode under either of the following conditions:
• When the group status is Failed, and there is no current synchronization of dirty regions in progress.
• When the group status is Normal.
To change a group's mode:
1. Right-click the group.
2. Select Change Mode. The Change Mode screen appears.
Using mirroring304