Mirroring is created in the Standby state. The mirroring coupling must then be
activated in order to start the Initialization process, which copies the data from the
master to the slave.
A storage system can have multiple mirroring definitions between pairs of peers
on various remote systems. However, when the peers are Consistency Groups, all
the volumes included in a specific Consistency Group must be mirrored between
only one pair of storage systems. Therefore, when a volume peer on a storage
system (for example: A) has a mirroring relationship with a volume on a remote
storage system (for example: B), any other volume in the same Consistency Group
on storage system A can only be defined in a remote mirroring relationship with a
volume on storage system B. The same goes for volumes from storage system B to
A. In addition, the mirrored CG has one sync job for all pertinent mirrored
volumes within the CG.
The command supports the creation of an asynchronous mirroring coupling.
Asynchronous mirroring is based on schedule-driven replication. The system also
offers a predefined schedule object with a non-user-configurable interval of 20
seconds, named min_interval. The mirrored CG has one sync job for all pertinent
mirrored volumes within the CG.
Issuing the command on a Consistency Group, the Consistency Group has to be
empty.
The command fails if it finds conflicting mirroring snapshots (that were not
removed during the deletion of a previous mirroring definition).
Initialization type:
v The online option - specifies over-the-wire initialization, or in other words
employs an inter-site link to replicate to the Slave the Master peer's initial state,
starting once the mirror is first activated (mirror_activate). During initialization
the mirror status will be Initialization.
v The offline option - specifies that initialization of the Slave peer will not be done
by replicating the Master's initial image, but rather through offline creation of a
replica - e.g., by restoring to the Slave a mirror image that is backed up on the
Master).
v The default value: online.
Access Control:
User Category Permission
Storage administrator Allowed
Storage integration administrator Allowed
Application administrator Disallowed
Security administrator Disallowed
Read-only users Disallowed
Technicians Disallowed
Completion Codes:
v ASYNC_MIRROR_MISSING_RPO
Definition of Asynchronous Mirror requires RPO to be specified.
v ASYNC_MIRROR_REMOTE_RPO_TOO_LONG
Specified Remote RPO is too long.
216 IBM XIV Storage System User Manual
To Next Page
Loading...
Need help?
General
