Name Type Description Mandatory Default
name Object name Name of the new
snapshot.
Y N/A
delete_
priority
Integer The deletion
priority of the
volume's snapshot.
N1
slave_name Object name Name of the new
snapshot on the
slave.
Y N/A
slave_
delete_
priority
Integer The deletion
priority of the
slave volume's
snapshot.
N1
This command synchronizes the Slave with the Master.
v In synchronous mirroring - the command takes a snapshot of the source peer
(Master) and the target peer (Slave) at exactly the same time.
v In asynchronous mirroring - the command establishes a process that takes a
point-in-time snapshot of the source peer (Master) and synchronizes it with the
Slave. The process sets a new sync-job that copies the differences between the
point-in-time snapshot and the most recent snapshot that is guaranteed to be
synchronized with the target peer.
Prerequisite (for both synchronous and asynchronous mirroring):
v The coupling has to be operational.
Multiple Snapshot Mirrors:
v Multiple snapshot mirrors can be issued; each mandates the creation of a
corresponding sync job
v Corresponding sync jobs are queued one after each other
Prioritization of sync-jobs:
v The snapshot mirror delays the execution of an interval-based mirror if it is
running upon arrival of a new interval.
v The snapshot mirror does not, however, cancel the creation of the interval-based
sync job. The interval-based mirror will be calculated based on the differences
between the most_recent snapshot and the last snapshot mirror.
Precedence of the last snapshot mirror over the last_replicated snapshot:
v The last_replicated snapshot of the Master will be updated to reflect the
completed snapshot mirror. Following the completion of the snapshot mirror, its
snapshot is duplicated and the duplicate is named last_replicated (the previous
last_replicated snapshot is deleted).
Cancelling a snapshot mirror:
v The administrator has the ability to cancel snapshot mirrors that have not yet
started.
IMPORTANT: The snapshots created concurrently on the Master and Slave are
identical.
The snapshot mirror results with the following:
v On the Slave - a snapshot is taken on the slave, named last_replicated
v On the Master - the pertinent snapshot that is mirrored onto the slave is also
named last_replicated
200 IBM XIV Storage System User Manual
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