HP StorageWorks Storage Mirroring for Linux User's Guide (T2558-96317, June 2009)

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Verification

Verification is the process of confirming that the data on the target

is identical to the data on the source. Verification creates a log file

detailing what was verified as well as which files are not

synchronized. If the data is not the same, Storage Mirroring can

automatically initiate a remirror. The remirror ensures data integrity between the source and target.

Manual verification

A manual verification can be run anytime a mirror is not in progress.

1. Right-click the connection on the right pane of the Management Console and select Verify.

2. Select the verification options that you would like to perform.

 Verify only—This option verifies the data and generates a verification log, but it does not

remirror any files that are different on the source and target.

 Remirror data to the target automatically—This option verifies the data, generates a

verification log, and remirrors to the target any files that are different on the source.

 Only if the source’s date is newer than the target’s—If you are remirroring your files,

you can specify that only files that are newer on the source than the target be remirrored.

 Use Checksum comparison to send minimal blocks of data—Specify if you want the

verification process to use a block checksum comparison to determine which blocks are

different. If this option is enabled, only those blocks (not the entire files) that are different will

be identified in the log and/or remirrored to the target.

3. Click OK to start the verification.

NOTE: If you are using a database application, do not use the newer option unless you

know for certain you need it. With database applications, it is critical that all files,

not just some of them that might be newer, get mirrored.

NOTE: Database applications may update files without changing the date, time, or file

size. Therefore, if you are using database applications, you should use the block

checksum comparison to ensure proper verification and remirroring.