Correlating Device Files to Physical Drives When Adding Drives
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NetBackup Media Manager System Administrator’s Guide for Windows
NetBackup polls locally-attached non-shared drives on the hosts where they are
configured when they are in the UP state and are not in use. However for shared drives,
polling is done only on the Scan Host until a mount request is received from NetBackup.
During a mount request, polling is transferred to the host requesting the mount once a
drive has been selected.
This design enables NetBackup to support Dynamic Loop Switching or SAN zoning.
Every drive needs to be visible only from a single-host perspective. Each drive can
potentially have its own Scan Host that switches dynamically for error handling and
continued availability. A central device arbitrating component (vmd/DA) manages scan
host assignments for shared drives. vmd/DA also handles a network drive reservation
system so that multiple media servers (or SAN media servers) can efficiently share a
drive.
Polling a shared drive from a single host is not a complete solution. It allows dynamic
loop switching and reduces the number of device accesses and associated CPU time, but it
does not allow for breakages in device connectivity (for example, discontinuity in the fibre
channel fabric) to be detected until the device is actually used for I/O.
Correlating Device Files to Physical Drives When Adding
Drives
The following two topics may not be necessary if you used the Device Configuration
Wizard to configure your drives and the drives and robotic libraries both support device
serialization.
The following point applies only to NetBackup Enterprise Server.
If you are configuring shared drives, see the NetBackup SSO system administrator’s
guide for more information.
On Windows Hosts
When selecting the drive address (for example, robot drive number) for a tape drive,
match the logical device name with the drives in the physical drive layout as follows:
▼
To correlate device files
1.
Note the SCSI target of the drive and check the Windows Tape Devices display to
determine which device name (for example, Tape0) was assigned to the drive.
2.
Correlate the SCSI target to the drive address using the robot’s interface panel or
checking the indicators on the rear panel of the tape drive.
Summary of Contents for NetBackupTM 5.0
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