Dell POWERVAULT MD3600I - Manual (Page 205)

NOTE: When the primary virtual disk and the secondary virtual disk are resynchronized, only data that has changed
on the primary virtual disk after the break in communication is transferred to the secondary virtual disk.
CAUTION: You should be aware of a possible loss of data if communication is broken after resynchronization starts
between the primary storage array and the secondary storage array. New data might mix with old data on the
secondary virtual disk and render the data unusable in a disaster recovery situation.
Changing Synchronization Priority And Method
Synchronization priority defines how much processing time and resources are allocated to synchronizing the primary
and secondary virtual disk of a remote replication relative to system performance. Increasing the synchronization
priority of a remote replication may degrade system performance. Synchronization priorities can be reset at any time.
Synchronization priorities can affect these operations:
• Performing a copyback
• Performing a Virtual Disk Expansion (VDE)
• Reconstructing a virtual disk
• Initializing a virtual disk
• Changing the segment size of a virtual disk
• Defragmenting a disk group
• Adding free capacity to a disk group
• Changing the RAID level of a disk group
To change the synchronization priority and method for an existing remote replication:
1. In the AMW of the storage array containing the primary virtual disk of the replicated pair, right-click the Storage &
Copy Services tab.
2. Select Change → Synchronization Settings.
The Change Synchronization Settings dialog is displayed.
3. In the Replicated pairs table, select the primary virtual disk and the remote virtual disk you want to change. To
select all virtual disks, click Select All.
4. On the Select Synchronization Priority slide bar, select the synchronization priority for the replicated pair.
5. Select either Manual or Automatic resynchronization.
– Automatic — Resynchronization starts immediately after communication is restored between
unsynchronized replicated virtual disks.
– Manual — The replicated pair must be manually resynchronized each time communication is restored
between unsynchronized replicated virtual disks.
6. Click OK.
The Change Synchronization Settings dialog is displayed.
7. In the Change Synchronization Settings dialog, click Yes.
The Change Synchronization Priority - Progress bar displays the progress of the resynchronization.
8. Click OK.
Unsynchronized Virtual Disks
Communication between a primary and secondary virtual disks can be either suspended, or become unsynchronized. If
this communication between both virtual disks is disrupted:
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