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H_Sharma's avatar
H_Sharma
Level 6
9 years ago

ALL_LOCAL_DRIVES and Cross Mount Points

Hello Experts,

We have cross mount points enabled with All_Local_Drives selected in backup selection in Standard policy.

I checked its not recommended.

"Do not select Cross mount points for policies where you use the ALL_LOCAL_DRIVES directive"

Could you please explain why is it so? Why we should not include both.

I want my whole unix machine backed up.

Thanks,

 

7.6
Backup and Recovery
Basics
Best Practice
NetBackup
UNIX
  • RiaanBadenhorst's avatar
    RiaanBadenhorst
    9 years ago

    Hi,

     

    It could backup a file system twice. From the note https://www.veritas.com/support/en_US/article.000044241

     

    "Do not use Cross mount points in policies on UNIX systems where you use the ALL_LOCAL_DRIVES directive in the backup selection list.

    Enabling Cross mount points can cause multiple backups of mounted volumes."

     

    Basically, if you use ALL_LOCAL_DRIVES netbackup will generate a new stream for each file system (/,/usr,/tmp,etc). If you've enabled Cross mount points then while the netbackup is busy backing up /, it will find /usr and reason that Cross mount points is enabled so it should cross the boundary and back /usr up too. Meanwhile there is a separate stream for /usr so it will be backed up twice.

     

    Use ALL_LOCAL_DRIVES if you want the entire system.

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  • Nicolai's avatar
    Nicolai
    Moderator
    9 years ago

    Just as a reference, its REQUIRED for Windows policies to have ALL_LOCAL_DRIVES and "Cross Mount Points" selected, else mounted folders won't be protected.

  • RiaanBadenhorst's avatar
    RiaanBadenhorst
    Level 6
    9 years ago

    Hi,

     

    It could backup a file system twice. From the note https://www.veritas.com/support/en_US/article.000044241

     

    "Do not use Cross mount points in policies on UNIX systems where you use the ALL_LOCAL_DRIVES directive in the backup selection list.

    Enabling Cross mount points can cause multiple backups of mounted volumes."

     

    Basically, if you use ALL_LOCAL_DRIVES netbackup will generate a new stream for each file system (/,/usr,/tmp,etc). If you've enabled Cross mount points then while the netbackup is busy backing up /, it will find /usr and reason that Cross mount points is enabled so it should cross the boundary and back /usr up too. Meanwhile there is a separate stream for /usr so it will be backed up twice.

     

    Use ALL_LOCAL_DRIVES if you want the entire system.

  • Marianne's avatar
    Marianne
    Level 6
    9 years ago
    If you really have it already enabled, you can easily see why it should not be done. Simply check the size of your backups against the size of filesystems on the client....