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Backup Exec 2014 and HP storageworks 1/8 2g autoloader

Created: 18 Aug 2014 • Updated: 03 Sep 2014 | 9 comments
This issue has been solved. See solution.

Hello everyone

Sorry if i am asking this question again.

i have an lt0-5 cartridge of 3tb on my tape device.

backup exec 2014 see's the cartridge as 1.5tb on 2 partition, what i mean is that. on backup exec, i see 1.5tb and 1.5tb.

i understand that the native capacity of an lt0-5 is 1.5tb.

what i need to know is backing up to both 1.5tb is this ok?

i manually insert the barcode for both partitions. my second question is if i decide to use barcode label on the cartridge will backup exec see it as 3tb or 1.5tb and 1.5tb

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CraigV's picture


1.5TB is the native 1:1 capacity, so this is correct. Backup exec is seeing the correct size of the tape. 3TB is 2:1 compression which you're not likely to get in the real world to be honest. A good compression ratio is between 1.2:1 and sometimes up to 1.6:1.

Backup Exec is reporting correctly, and putting barcode labels on won't see the 3TB helps with management of tapes.


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vovocals's picture


please look at the image below.

i inserted an lt0-5  cartridge of 3tb onto my tape device.

the size that i saw was 2.78tb

the slots tho, are 1.3tb and 1.3tb

pkh's picture

If you have 2 tapes in the library then the total capacity would be reported as 2.7Tb

vovocals's picture

hello pkh

yes i have 2 tapes in the library. u might be correct to say thats why i see 2.78tb

but what about the 4.17tb?

the backup job is set to keep the data for four weeks. does this mean that after 4 weeks it will be overwritten?

CraigV's picture

...yes they will be overwritten/appendable after 4 weeks.


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pkh's picture

You have 3 tapes, 2 online and 1 offline, meaning not in the library. The total capacity of 3 tapes is 4.1Tb.

After 4 weeks, the tapes can be overwritten if your job needs it. If your job site not need them then they will not be overwritten and the days on them will remain intact

vovocals's picture

hello pkh.

i only have two tapes. the 1 offline is actually inside the device. i haven't been able to bring it back online.

let me explain.

i had just one tape before. backuped up data into it. for some reasons it didnt come back online

i inserted a new tape into the device. making it two tapes now.

the new one shows up as 2.7tb

where the 4.17tb is coming from i dont know

i am about to pay for the symantec license and need to be sure of this

pkh's picture

Right-click on the tape library and select inventory so that BE can recognize the 3rd tape. You need to inventory/scan the tape library each time you add/remove tape from the library. Otherwise the changes will not be reflected in the BE console.

Take a look at your screenshot, the 4.1Tb is from all media which includes both online and offline tapes

CraigV's picture

LTO5 is 1.5TB native (1:1 compression!) and 3TB compressed (2:1) below:

Never go according to the compressed size of the tape.

1.3TB on a 1.5TB tape means you're either not backing up enough data, backing up data that is compressing to less than 1.5TB, or backing up data that is getting less compression (ie. 0.9:1 if you are perhaps backing up compressed data that is increasing in size).

Check the compression on the tape...this will tell you what you are getting.


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