Not sure that you can, when a media server starts working on a tape, that tape belongs to that media server.
I know there is now an option to share media Change Media Owner dialog box Overview 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 <mk:@MSITStore:C:\Program%20Files\Veritas\Help\nbadmin_win.chm::/nbu_hos t_help205.htm#wp1076661> . *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 <mk:@MSITStore:C:\Program%20Files\Veritas\Help\nbadmin_win.chm::/nbu_med ia_help56.htm#wp2829879> or Changing the properties of a volume pool <mk:@MSITStore:C:\Program%20Files\Veritas\Help\nbadmin_win.chm::/nbu_med ia_help57.htm#wp2829893> . *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 <mk:@MSITStore:C:\Program%20Files\Veritas\Help\nbadmin_win.chm::/nbu_pol _help8.htm#wp2390005> . Related topics *Changing the owner of a volume <mk:@MSITStore:C:\Program%20Files\Veritas\Help\nbadmin_win.chm::/nbu_med ia_help17.htm#wp2828815> 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 <mk:@MSITStore:C:\Program%20Files\Veritas\Help\nbadmin_win.chm::/nbu_dev ices_help34.htm#wp2601138> . ________________________________ From: veritas-bu-boun...@mailman.eng.auburn.edu [mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of Mark .. Sent: Wednesday, May 20, 2009 11:08 AM To: veritas-bu@mailman.eng.auburn.edu Subject: [Veritas-bu] How to configure multiplexing? Hi, I'm currently using NBU 6.5 MP3, the environment is consisted of 54 media servers and 24 LTO4 tape drives. Each of the media servers have 2 policy each. I would like to configure 20 out of 54 media servers to write data to a single tape using one single drive only (assuming that the data is small enough to be written to a single media). How do i achieve that? What's happening currently is that these 20 media servers will use 20 tape drives to write to 20 tapes or these 20 media servers will write using a single tape drive but still to 20 different tapes. Both of the scenarios mentioned is not acceptable. Thanks ------There are 10 types of people in this world; those that understand binary and those that don't.------- Abid <http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/14.gif>
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