Dell PowerVault MD3420 - Manual (Page 296)

Parameter Description
secondary virtual disks of a remote-replicated pair.
This parameter has these values:
• enabled – Automatic resynchronization is
turned on. You do not need to do anything
further to resynchronize the primary virtual
disk and the secondary virtual disk.
• disabled – Automatic resynchronization
is turned off. To resynchronize the primary
virtual disks and the secondary virtual disk, you
must run the resume remoteReplication
command.
writeOrder This parameter defines write order for data
transmission between the primary virtual disk and
the secondary virtual disk. Valid values are
preserved or notPreserved.
writeMode This parameter defines how the primary virtual disk
writes to the secondary virtual disk. Valid values are
synchronous or asynchronous.
force The role reversal is forced if the communications
link between the storage arrays is down and
promotion or demotion on the local side results in
a dual-primary condition or a dual-secondary
condition. To force a role reversal, set this
parameter to TRUE. The default value is FALSE.
Notes
When you use this command, you can specify one or more optional parameters.
Synchronization priority defines the amount of system resources that are used to synchronize the data
between the primary virtual disks and the secondary virtual disks of a replication relationship. If you select
the highest priority level, the data synchronization uses the most system resources to perform the full
synchronization, which decreases the performance for host data transfers.
The writeOrder parameter applies only to asynchronous write modes and makes them become part of
a consistency group. Setting the writeOrder parameter to preserved causes the remote-replicated
pair to transmit data from the primary virtual disk to the secondary virtual disk in the same order as the
host writes to the primary virtual disk. In the event of a transmission link failure, the data is buffered until a
full synchronization can occur. This action can require additional system overhead to maintain the
buffered data, which slows operations. Setting the writeOrder parameter to notPreserved frees the
system from having to maintain data in a buffer, but it requires forcing a full synchronization to make sure
that the secondary virtual disk has the same data as the primary virtual disk.
Set Remote Replication Group
Description
Use this command to change the synchronization settings and warning thresholds that the RAID
controller module owner of the primary side of the remote replication group uses when it performs an
initial synchronization or resynchronization. Changing the synchronization settings affects the
synchronization operations of all replicated pairs within the remote replication group.
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