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Backup job with Partitions

Created: 20 Aug 2013 • Updated: 17 Sep 2013 | 8 comments

Hi, 

I have created a job to backup configured as follows:
- one partition that contains two slots (slot14,slot15).
- Slot14 : contains LTO5 scratch Tape.
- Slot15 : contains LTO4 sratch Tape.

When the job begins, it starts writing on LTO4 tape available in Slot15.
Could you please explain this behavior, as it should start writing by order 14 then 15 since both tape are scratch.

Any Idea ?

Thanks

Tarek Faraj 

Operating Systems:

Comments 8 CommentsJump to latest comment

Jaydeep S's picture

Are you using LTO 5 or LTO 4 Tape drive unit. Also, does this happen on each and every run?

Tfaraj's picture

I am using LTO 5 Tape drive unit.

Regards,
Tarek Faraj

CraigV's picture

...the type of drive wouldn't matter unless you had an LTO4 drive trying to read LTO5 tapes.

There would be no preference on a hardware level to use the lower version of LTO tape first.

Thanks!

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CraigV's picture

Hi,

If you want to create partitions, separate the slots with the LTO4 and LTO5 tapes further.

Otherwise the backup that is targeted to that partition is going to use the first tape available to be written too...it won't care if it is LTO5 or LTO4.

Order and numbering of slots won't matter, but I think in your example above it's kind of a luck-of-the-draw that it selects slot 15 first.

Thanks!

Alternative ways to access Backup Exec Technical Support:

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ZeRoC00L's picture

http://www.symantec.com/business/support/index?page=content&id=HOWTO73442

When the robotic library is partitioned, Backup Exec searches for the oldest recyclable media in the targeted partition only.

So probably your LTO4 tape is older than the LTO5 tape !

If this response answers your concern, please mark it as a "solution"

Colin Weaver's picture

Might even be that when you inventoried or scanned the slots on first insert of the tapes, that you did slot 15 before Slot14 (even if only by a few minutes) which caused the more obvious order to be reversed because the last update against Slot 15 was older then Slot 14.

pkh's picture

BE does not use scratch tapes at random.  It will use the tape with the oldest allocation date.  This date will change depending on when the tape is ovewritten or erased.

dl2rcf's picture

will BE use tapes according to the oldest allocation date regardless of the 2 settings below?

When Backup Exec searches for overwritable media for a
backup job, it searches for either scratch media or media that has an expired
overwrite protection period.
You are prompted to select one of the following types of media that you want
Backup Exec to use first:
■ 1. Overwrite scratch media before overwriting recyclable media contained in the
targeted media set.
If you choose to overwrite scratch media before recyclable media, more media
may be required for the same number of jobs, but the recyclable media may
be preserved longer for possible recovery.
■ 2. Overwrite recyclable media contained in the targeted media set before
overwriting scratch media.
If you choose to overwrite recyclable media before scratch media, you will
re-use the same media more frequently than if you choose to overwrite scratch
media before recyclable media.

In a device pool, Backup Exec selects the oldest recyclable media in all of the
devices in the device pool to use first.
In a robotic library, Backup Exec selects the oldest recyclable media in the library
to use first. If the robotic library is partitioned, Backup Exec searches for the
oldest recyclable media in the targeted partition only.

...or in other words: Are for BE's search for the oldest recyclable media the "scratch media" and the "targeted media" the same pool?

If yes: What use is the radio button 1./ 2. then???