Seagate ST39175LW Guía para resolver problemas descargar pdf (Pagina 132)

Best Practices

118 NetBackup ServerFree Agent System Administrator’s Guide

Backup Policies in Conflict: Two Backups Accessing Volume s Distributed on Same Disks

Avoiding Concurrent Access Conflicts

These are recommendations for backups that encounter any of the concurrent-access

problems when using Extended Frozen Image Services.

◆ Schedule the policies so that none can start a backup at the same time as another.

◆ If possible, combine the separate policies into one policy. The entries in the policy’s

file list will be backed up sequentially: backup of the first entry completes before the

second begins. No frozen-image access conflicts can occur.

◆ If you want the backups to run concurrently, combine the separate policies into one

and configure that policy for multiple data streaming. Multiple data streaming

prevents concurrent backups from encountering frozen image conflicts. See the

NetBackup DataCenter System Administrator’s Guide for help with multiple data

streams.

◆ If the data to back up is configured in Volume Manager (VxVM) volumes, use the

vxvm frozen image method included in the Core Frozen Image Services option, rather

than an Extended Frozen Image Service method. The vxvm method allows frozen

image backups to run concurrently without conflicts, provided that the backup data

consists of file systems mounted on VxVM volumes. See “Creating a Snapshot Mirror

of the vxvm Frozen Image Source” on page 89 for help with the vxvm method.

◆ Use the Volume Manager administration interface to determine which disks the

volumes are configured on, and configure the volumes on different disks.

Backup policy B

File list: /dev/vx/rdsk/dg/vol_2

Backup policy A starts to back up /vol_1; both disks A and B are locked to

make a frozen image of /vol_1. Backup policy B attempts to back up /vol_2

and requests frozen image: disks A and B are already locked—access denied.

Backup policy A

File list: /dev/vx/rdsk/dg/vol_1

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Seagate ST39175LW Guía para resolver problemas Pagina 132