[Veritas-bu] Changing tape drive paths

Justin,

Don't mess with turning the compression off on the tape drive.   If the data
is already compressed the tape drive will not affect it.  You gain nothing
and make management a nightmare if you try to work with compression on/off
depending on the backup policy.  However, if you insist on doing a bn/cbn
configuration, I recommend having two or more drives and configure one
without compression, put it in a separate storage unit and use that STU for
the backup of the file system.

HTH,
Rockey 

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] 
Sent: Wednesday, January 21, 2004 1:29 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Changing tape drive paths

I am just now setting up a backup system using NBU 4.5MP6 on a Sun
Enterprise 5500 server running Solaris 9.

Most of the data I will be backing up is typical Unix and Windows stuff,
plus some Oracle databases.  However, on my SAN I have a 6 TB filesystem
that will eventually be about 95% full.  The vast majority of that data will
already be compressed (using a proprietary format), so I would not want to
use the hardware compression device.  But for everything else (presumably) I
would want to use compression.

The only way I can think to handle this is to use, for example,

    tpconfig -update -drive 0 -path /dev/rmt/0bn

in a notify script (maybe session_start_notify) and then

    tpconfig -update -drive 0 -path /dev/rmt/0cbn

in the corresponding end script (session_notify).  If I were to do this, I
know I would need to make sure that the 6 TB filesystem is the only one that
would run in the session.

Does anyone have experience with this sort of a situation, or am I just
overlooking a better method of handling this?

Thanks,

Justin


--
Justin C. Lloyd
Unix System Administrator
MCI System Technology Solutions
Office 703.886.3219 Vnet 806.3219 Fax 703.886.0132

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