I think this is a mistake.
Media type (hcart, dlt, hcart2) etc is just a label -
part of the media database. It exists per tape regardless of the backups
on it. Volume Pool is what's usually assigned through backup
creation. You can change the media type (via the vmchange) command
regardless of assignment status.
hcart, hcart2, etc. are just labels. Netbackup
matches the media type of an individual tape to the storage unit type. It
doesn't know that hcart2 is a superset of hcart1. It doesn't know hcart2
is anything, really, other than a label. To NB, hcart & hcart2 are as
different as hcart & dlt - they're different media types and are therefore
different tapes.
I know that I can change the media type on an LTO1 tape
from hcart to hcart2 and all of a sudden Netbackup will start reading and
writing that tape in the LTO2 drives (since they're type is hcart2 in the
storage unit definitions). Change it back to hcart1 and it'll only
be read & written in LTO1 drives. I have to know that the two media
types are backwards compatible and manage that myself.
If you built an all new system and started with LTO4 tapes
and called them hcart type, you'd be just fine as long as the media type on
the storage units and the media types on the tapes themselves
match.
They should've called it "type1" and "type3" rather than
anything that implied a physical type - it'd avoid this kind of
confusion.
-M
You should've changed media and drive type before doing backups. You
can change drive type and media type of unassigned tapes, not once you've
written backups to it. Throughput is determined by physical capabilities, not
drive type in NBU config.
-----Original Message----- From: sql_noob
<netbackup-forum AT backupcentral DOT com>
Sent: 05 May 2009 21:48 To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
<VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU>
Subject: [Veritas-bu] LTO4 recognized as DLT
i just had the same
thing happen to me on NB 6.5.3. we're still in the testing stage of a new HP MSL
8096 and NB 6.5.3 running on a HP x86 server on Windows 2003.
the
compatibility list says the robot is type TLD and it recognized it as such. all
the tapes were recognized as DLT. we're getting very good perfomance, but long
term we might connect an old autoloader to this to import old DLT tapes and i'm
concerned this may be a problem.
should I delete the robot and set it up
again making sure it says HCART3? we're using LTO-4 drives and
tapes
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