ADSM-L

[ADSM-L] ?how to force NDMP LAN-free backups to fill one tape before writing on another?

2008-11-13 20:49:45
Subject: [ADSM-L] ?how to force NDMP LAN-free backups to fill one tape before writing on another?
From: James R Owen <Jim.Owen AT YALE DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Thu, 13 Nov 2008 20:48:21 -0500
I am trying to force NDMP LAN-free backups to keep the same tape mounted
and serially reuse it when a NetApp filer needs to write multiple backups.

We have just implemented our first NDMP LAN-free backups w/ TSM v5.5.1.1,
w/ a single NetApp filer backing up 16 VirtualFS from nightly snapshots,
e.g.,
DEFine VIRTUALFSmapping netapp-01 /x.snap /vol/volx /.snapshot/nightly.0

I was disappointed to find that DEVType=NAS requires MOUNTRetention=0:
e.g.,
DEFine DEVclass LTO3N LIBRary=bec3584 DEVType=NAS ESTCAPacity=800G -
MOUNTRetention=0 MOUNTWait=5
[that forces a tape dismount after each NDMP backup, right?]

We use LTO1 scratch tapes in our 3584 library so I defined 10 * LTO3
volumes into our new BackupL3N STGpool:

DEFine STGpool BackupL3N LTO3N POoltype=PRimary DATAFOrmat=NETAPPDump -
COLlocate=Group [=default setting] MAXSCRatch=0

The filer wrote NDMP backups on all 10 tapes, so I did MOVE DATA's to
collocate all of the backups back onto a single tape and tried:

UPDate STGpool BackupL3N COLlocate=Node

Same results:  NDMP backups on all 10 tapes again!

Help?  [or is that just how NDMP backups work?]
--
Jim.Owen AT Yale DOT Edu   (203.432.6693)

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