Hp Storage Mirroring Software User Manual download pdf (Page 528)

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Connections Page 527 of 677

has 10 KB left until the limit and the next operation to be applied to that file

is greater than 10 KB, a new transaction log file will be created to store that

next operation. Also, if one operation is larger than the defined size limit, the

entire operation will be written to one transaction log.

3. When system memory is full, the most recent changed data is added to the disk

queue, as described in step 2. This means that system memory contains the oldest

data. Therefore, when data is transmitted to the target, Storage Mirroring Recover

pulls the data from system memory and sends it. This ensures that the data is

transmitted to the target in the same order it was changed on the source. Storage

Mirroring Recover automatically reads operations from the oldest transaction log

file into 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 1).

4. To ensure the integrity of the data on the target, the information must be applied in

the same order as it was on the source. If there are any delays in processing, for

example because of a locked file, a similar queuing process occurs on the target.

Data that cannot immediately be applied is queued to system memory. By default,

128 or 512 MB of memory is used, depending on your operating system.

5. When the allocated amount of system memory on the target is full, new incoming

data bypasses the full system memory and is queued directly to disk. Data queued

to disk is written to a transaction log. On the target, the transaction logs are

identified with the source IP address, the Storage Mirroring Recover port, the

connection ID, and an incrementing sequence number.

Like the source, system memory on the target contains the oldest data so when data is

applied to the target, Storage Mirroring Recover pulls the data from system memory.

Storage Mirroring Recover 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).

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Hp Storage Mirroring Software User Manual Page 528

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