HP StorageWorks SAN Virtualization Services Platform Administrator Guide (5697-0934, May 2011)

NOTE:
• Whenever possible, use Force Resume before using Force Delete. Force Resume maintains
the synchronous mirror group structure and allows the option to resume mirroring with the
failed site after the site is recovered. A Force Delete operation deletes the synchronous mirror
structure and forces you to recreate the synchronous mirror group and the synchronous mirror
group jobs.
• Single component failures can usually be recovered by using the standard management
operations of synchronous mirroring (resynchronization, resume, change operation mode,
break, or delete). Only use Force Resume and Force Delete as a last resort for multiple failures,
site failures, and extended intersite link outages.
Recovering the surviving site by using Force Resume
1. If possible, on the site that is down, turn off the power to all of the DPMs that are involved in
synchronous mirroring and the VSM server.
Turning off the power to all of the DPMs prevents the DPMs or intersite links from coming online
unexpectedly when you restore power.
NOTE: You can also disconnect the intersite links at the end of the surviving site.
2. On the surviving site, take the necessary actions to allow the VSM to become active. If needed,
use the options in the Recovery tab on the VSM monitor.
Whenever you select an entry and click the Yes button or the OK button, make sure that the
status of the VSM is Passive. The entries from the Recovery tab are not accepted when the
VSM is stopped.
The first window on the Recovery tab asks your permission to use the surviving copy of the
boot data and to ignore the missing ones. Figure 36 (page 90) shows the Recovery tab
message asking if you want the VSM to attempt to become active.
Figure 36 Recovery tab—Attempt to become active
The second window on the Recovery tab (Figure 37 (page 91)) notifies you that the synchronous
mirror of the setup virtual disk has a status of Partial. A status of Partial means that some of
90 Site failure recovery with synchronous mirroring