Silicon Graphics InfiniteStorage 4000 Series, Настройка и обслуживание

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Chapter 7: Using the Asynchronous Mirroring Premium Feature 135
Suspending
and Resuming
the
Asynchronous
Mirror Group Use the
suspend asyncMirrorGroup
command to stop data transfer between
all of the primary volumes and all of the secondary volumes in an asynchronous
mirror group without disabling the asynchronous mirroring relationships. Suspending
the asynchronous mirroring relationship lets you control when the data on the primary
volume and data on the secondary volume are synchronized. Suspending the
asynchronous mirroring helps to reduce any performance impact to the host
application that might occur while any changed data on the primary volume is copied
to the secondary volume. Suspending the asynchronous mirroring is particularly
useful when you want to run a backup of the data on the secondary volume.
When the asynchronous mirroring relationship is in a suspended state, the primary
volume does not make any attempt to contact the secondary volume. Any writes to the
primary volume are persistently logged in the asynchronous mirroring repository
volumes. After the asynchronous mirroring relationship resumes, any data that is
written to the primary volume is automatically written to the secondary volume. Only
the modified data blocks on the primary volume are written to the secondary volume.
Full synchronization is not required.
This example shows the
suspend asyncMirrorGroup
command:
c:\...\sm X \client>smcli 123.45.67.88 123.45.67.89

-c “suspend asyncMirrorGroup ["amg_001"];”
The asynchronous 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 asynchronous mirror group name has special
characters, such as a colon as used in this example
"amg:001"
. The double
quotation marks also must be used if the asynchronous mirror group name is only a
number, as in this example
"001"
. Using double quotation marks when not needed
does not prevent the command from running successfully. If you have any doubts
about the asynchronous mirror group name, use the double quotation marks inside the
square brackets.
This example shows how to use the command in a script file:
suspend asyncMirrorGroup ["amg_001"];
The mirror relationship remains suspended until you use the
resume
asyncMirrorGroup
command to restart synchronization activities. This
command restarts data transfers between a primary volume and a secondary volume
in a mirror relationship after the mirror has been suspended or unsynchronized.
This example shows the
resume asyncMirrorGroup
command:
c:\...\sm X \client>smcli 123.45.67.88 123.45.67.89

-c “resume asyncMirrorGroup ["amg_001"];”
This example shows how to use the command in a script file:
resume asyncMirrorGroup ["amg_001"];