10400414-002 05/2013
©2013 Overland Storage, Inc.
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SnapSAN S5000 Data Migration User Guide
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Data migration cannot be started if the activity is "restored", when the destination
logical disk is used as a RV.
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The following operations cannot be carried out when the destination logical disk is
used as a base-volume (BV) by the snapshot function.
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Data migration cannot be started if data is restored from a snapshot-volume (SV),
when the destination logical disk is used as a BV.
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Data migration cannot be started if the destination logical disk is associated with a
link-volume (LV), when it is used as a BV.
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Data migration cannot be started if volumes of the destination logical disk are
protected by the WORM function.
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Data migration cannot be started if using volumes of the destination logical disk is
stopped by the power saving function.
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Data migration cannot be started if the destination logical disk is set as a reserve
group.
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The multiplicity of copies from the source logical disk to the destination logical disk
differs depending on the speed level option specification. In addition, the effectiveness
the speed level option differs depending on the load and performance of the disk array,
I/O performance of the source and destination logical disks, and configuration of the
connection between the source disk array and destination disk array.
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During data migration stopping operations, the ongoing operations and data migration
may affect each other's I/O performance. (Compared to data migration stopping the
server, the I/O speed decreases by about 30%.) To prevent a decrease in I/O
performance, it is recommended to specify the speed level option of the iSMmc_start
command as 2 or less, or reduce the number of pairs that will be migrated at the same
time.
Stopping Data Migration
The iSMmc_stop command stops data migration.
When the command is issued during data migration, the data migration is stopped. After the
differences are completely copied, the data migration is completed. Forced stop can stop the
migration immediately.
Main options
The iSMmc_stop command recognizes the following options and arguments:
Source logical disk specification (-src src -srcflg srcflg)
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Specify the source logical disk and its volume type.
Forced stoppage specification (-force)
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By specifying the -force option, data migration can be forcibly stopped.
Suspending Data Migration
The iSMmc_suspend command suspends data migration.
Main options
The iSMmc_suspend command recognizes the following options and arguments:
Source logical disk specification (-src src -srcflg srcflg)
Specify the source logical disk and its volume type.
