HP Storage Mirroring Software - Manual (Page 59)

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6. Like the source, system memory on the target contains the oldest data so when data is applied
to the target, Storage Mirroring pulls the data from system memory. Storage Mirroring
automatically moves operations from the oldest transaction log file to system memory. As a
transaction log is depleted, it is deleted. When all of the transaction log files are deleted, data is
again written directly to system memory (step 4).