IBM System Storage DS3000, Programming Manual

Page: 470 / 652

v
Synchronization warning threshold – Time to wait until a warning is triggered when the
synchronization of logical drives takes longer than the defined time.
v
Recovery warning threshold – Time to wait until a warning is triggered when the automatic data
update for the point-in-time image on the remote storage subsystem is older than a defined time.
v
Warning threshold percent – Percentage of capacity of the mirror repository logical drive at which a
warning is sent if the mirror repository logical drive is nearing full.
v
User label – A new name for the Enhanced Global Mirror Group.
v Automatic resynchronization – A setting to enable or disable automatic resynchronization between the
primary logical drive and the secondary logical drive.
v
Logical drive – A repository logical drive for which you want to increase the capacity.
v
Repository logical drive – An unused repository logical drive that you want to add to another
repository logical drive to increase capacity.
v
Role – A setting to change the role, primary or secondary, of the logical drives in an Enhanced Global
Mirror Group.
v
Force – The setting to force a role change on the local storage subsystem if the link between the local
storage subsystem and the remote storage subsystem is not available.
v
No synchronization – A setting to force synchronization before a role change.
This example shows how to use the set enhancedGlobalMirrorGroup command to increase the capacity of
a repository logical drive:
c:\...\smX\client>smcli 123.45.67.88 123.45.67.89
-c “set enhancedGlobalMirrorGroup \"amg_001\"
logicalDrive="\repos_006\" increaseRepositoryCapacity
repositorylogicalDrives=("\repos_0020\" "\repos_0021\");”
This example shows how to use the command in a script file:
set enhancedGlobalMirrorGroup "amg_001"
logicalDrive="repos_006" increaseRepositoryCapacity
repositorylogicalDrives=("repos_0020" "repos_0021");
Suspending and resuming the Enhanced Global Mirror Group
Use the suspend enhancedGlobalMirrorGroup command to stop data transfer between all of the primary
logical drives and all of the secondary logical drives in an Enhanced Global Mirror Group without
disabling the Enhanced Global Mirroring relationships. Suspending the Enhanced Global Mirror
relationship lets you control when the data on the primary logical drive and data on the secondary
logical drive are synchronized. Suspending the Enhanced Global Mirroring helps to reduce any
performance impact to the host application that might occur while any changed data on the primary
logical drive is copied to the secondary logical drive. Suspending the Enhanced Global Mirroring is
particularly useful when you want to run a backup of the data on the secondary logical drive.
When the Enhanced Global Mirroring relationship is in a suspended state, the primary logical drive does
not make any attempt to contact the secondary logical drive. Any writes to the primary logical drive are
persistently logged in the Enhanced Global Mirroring repository logical drives. After the Enhanced Global
Mirror relationship resumes, any data that is written to the primary logical drive is automatically written
to the secondary logical drive. Only the modified data blocks on the primary logical drive are written to
the secondary logical drive. Full synchronization is not required. This example shows the
suspend
enhancedGlobalMirrorGroup
command:
c:\...\smX\client>smcli 123.45.67.88 123.45.67.89
-c “suspend enhancedGlobalMirrorGroup ["amg_001"];”
The Enhanced Global Mirror Group name is
amg_001
. You must enclose the name in square brackets. In
this example the double quotation marks are optional. The double quotation marks must be used if the
Enhanced Global Mirror Group name has special characters, such as a colon as used in this
7-10
IBM System Storage DS3000, DS4000, and DS5000: Command Line Interface and Script Commands Programming Guide