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bsr provides various functions such as FastSync, checksum-based synchronization, truck-based synchronization, and bitmap clear synchronization for efficient synchronization.
Fast Synchronization
bsr has improved changed the existing full synchronization method that performs for the entire disk area to Fast Synchronization( FastSync), which synchronizes only the area used by the file system. bsr collects file system's usage area information for FastSync, records the usage area in OOS and performs synchronization.FastSync is applied at the time of For example, if you are only using 100MB on a 1TB disk, initial synchronization can be completed 10 times faster than the existing full synchronization (1TB) because only 100MB disk area is synchronized. FastSync operates at the following times.
Initial full synchronization (bsradm primary --force
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Manual full synchronization (invalidate/invalidate-remote
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Online Verify check (bsradm verify)
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Note! FastSync must first obtain information about the file system usage from the disk space before performing initial synchronization, but if the file system is damaged (broken), information about the used area may be processed inaccurately. If FastSync is processed without recognizing this, it will result in inconsistent consistency between the source and target, so you must be very careful. Therefore, in order to prepare for this situation, bsr first requests a file system integrity check (chkdsk or fsck) before performing initial synchronization through bsradm primary --force, and enables FastSync when there are no problems with the results. Before performing bsr initial synchronization, the administrator needs to perform a file system integrity check to determine the health status of the clone disk in advance. |
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To change to the old FullSync method bsrcon /set_fast_sync 0 When you want to know the current initial synchronization method bsrcon /get_fast_sync |
Checksum-based synchronization
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