Use this dialog box to change the
owner of the selected volume.
For media
sharing, the media
owner defines who can write to the volume.
Valid only if a server group owns
the selected volume.
But in reading this it still looks
like only 1 media sever can write to a volume.
Why so many media servers?
Configuring server groups for media
sharing
Note: The
access control feature of Sun StorageTeck ACSLS controlled robots is not
compatible with media sharing. Media sharing restricts volume access by
the requesting hosts IP address. Use caution when you implement media sharing
in an ACSLS environment.
You can configure server groups
that can share media. A server group is a group of NetBackup servers
that are used for a common purpose. A media sharing group is a server
group that shares media for write purposes. A media sharing group can contain
the following:
•NetBackup
master server
•NetBackup
media servers
•NDMP
tape servers
•Virtual
host names of NetBackup media servers in a cluster
Servers can be in more than one
group. All members of a server group must have the same NetBackup master
server. Only NetBackup 6.5 and later systems can be in server groups.
Media sharing provides the following
benefits:
•Increases
media utilization by reducing the number of partially full media.
•Reduces
media-related expenses because fewer media are required and fewer media
are vaulted (NetBackup Vault option).
•Reduces
administrative overhead because you inject fewer scratch media into the
robotic library.
•Increases
media life because media are mounted fewer times. Media are not repositioned
and unmounted between write operations from different media servers.
Reducing media mounts requires appropriate
hardware connectivity between the media servers that share media and the
drives that can write to that media. Appropriate hardware connectivity
may include Fibre Channel hubs or switches, SCSI multiplexors, or SCSI-to-fibre
bridges.
To configure media sharing, you
must do the following:
•Ensure
the appropriate connectivity between and among the media servers and robots
and drives.
•Optionally,
configure NetBackup for media sharing by setting the master server Enable
Unrestricted Media Sharing for All Media Servers host property.
For more information, see Media
properties.
•Optionally,
configure the volume pools to use for media sharing by setting the Maximum
number of partially full media property for those pools.
For more information, see Adding
a new volume pool or Changing the properties of a volume pool.
•Create
the media sharing groups as described in this section.
If you allow unrestricted allow
media sharing in your NetBackup environment, you do not have to create
media sharing groups. Unrestricted media sharing is set by using the master
server Enable Unrestricted Media Sharing for All Media Servers host
property.
•Configure
backup policies that use the volume pools and media sharing groups by setting
the Policy Volume Pool and Media Owner properties of the
backup policies.
For more information, see Policy
Attributes tab.
Related topics
•Changing
the owner of a volume
To create a server group
1. In
the NetBackup Administration Console, select Media and Device Management
> Devices > Server Groups.
2. Select
Actions > New Server Group.
3. In
the New Server Group dialog box, enter or select the appropriate information.
To add a server to the group, select
it in the Servers Not in Group window and click Add.
To remove a server from the group,
select it in the Servers in Group window and click Remove.
For descriptions of the fields,
see Server group properties.
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