Seagate ST39175LW Průvodce řešením problémů stáhnout pdf (Strana 32)

Processing Before and After the Frozen Image

18 NetBackup ServerFree Agent System Administrator’s Guide

Note If additional disk drives are available and virtual volumes have already been

configured with the VERITAS Volume Manager 3.1 or later, choose a mirror frozen

image method.

Processing Before and After the Frozen Image

NetBackup performs several vital functions prior to creating a frozen image, as outlined

below and in the following text. Without this pre-processing, the integrity of the frozen

image cannot be guaranteed and the backup data may be of no value.

NetBackup Processing Before and After Creating the Frozen Image

Getting the Dust to Settle: Quiescing the System

Before a useful frozen image can be created, the target data must be transactionally

consistent or complete. A transaction is a single data action, such as updating a patient’s

record in a medical database, or creating a record for a new patient. Such a transaction is

composed of multiple I/O requests (search, copy, send, write, and so forth). Until the

transaction’s I/O requests are complete, the data is inconsistent and may be unsuitable for

backup.

1. Backup process requests database quiesce.

2. Database application quiesces (must wait for transactions

to complete).

3. Lock and flush the file system.

4. Create the frozen image.

5. Unlock the file system.

6. Release (unquiesce) the application.

7. Back up the frozen image.

8. Remove the frozen image.

Steps 1, 2, and 6 apply

only to databases, such

as those requiring

NetBackup for Oracle

ServerFree Agent.

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Seagate ST39175LW Průvodce řešením problémů Strana 32