Dell PowerVault MD3620f Command Line Interface Manual page 248

writeOrder
writeMode
Notes
When using this command, one or more of the optional parameters can be
specified.
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 the highest priority level is
selected, 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 replications and
makes them become part of a consistency group. Setting the writeOrder
parameter to preserved causes the remote replication 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.
248
Script Commands
This parameter defines write order for data transmission
between the primary virtual disk and the secondary
virtual disk. Valid values are
notPreserved
This parameter defines how the primary virtual disk
writes to the secondary virtual disk. Valid values are
or
synchronous
preserved
.
asynchronous
or
.