Seagate ST39175LW Guía para resolver problemas descargar pdf (Pagina 130)

Best Practices

116 NetBackup ServerFree Agent System Administrator’s Guide

When the frozen image process is started, NetBackup reserves or “locks” the secondary

(mirror) disk for that backup job, denying any other backup jobs access to that disk. If a

second backup job requests a frozen image involving data on the same disk before the first

job is complete, access is denied and the second job fails.

This conflict can arise when there are two backup policies, each using an Extended Frozen

Image service, and each requires access to the same disk at the same time (see diagram).

Backup Policies in Conflict: Two Backups Accessing Same Disk

Note Frozen image disk locks are applied to the entire disk: when a backup job requires a

frozen image, the entire disk is locked.

To avoid this conflict, see “Avoiding Concurrent Access Conflicts” later in this chapter.

Backups Concurrently Accessing VxVM Volumes

A conflict occurs if two or more concurrent backups using Extended Frozen Image

Services attempt to access data configured in the same Volume Manager volume or in

volumes configured on the same disk(s).

Concurrent Access to Same VxVM Volume

In this case, a conflict occurs if two or more backups using Extended Frozen Image

Services attempt to access the same Volume Manager volume at the same time.

Backup policy A

File list:

/file_sys1

Backup policy B

File list:

/file_sys2

Backup policy A starts job to back up /file_sys1;

mirror is locked to make frozen image. Backup policy

B attempts to back up /file_sys2 and requests frozen

image: mirror is already locked—access denied.

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Seagate ST39175LW Guía para resolver problemas Pagina 130