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vovocals's avatar
vovocals
Level 4
10 years ago

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

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

 

2014
Backing Up
Backup and Recovery
Backup Exec
Best Practice
Windows Server (2003-2008)
  • CraigV's avatar
    CraigV
    10 years ago

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

    http://en.wikipedia.org/wiki/Linear_Tape-Open

    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.

    Thanks!

  • pkh's avatar
    pkh
    10 years ago
    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

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  • CraigV's avatar
    CraigV
    Moderator
    10 years ago

    Hi,

    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 size...it helps with management of tapes.

    Thanks!

  • vovocals's avatar
    vovocals
    Level 4
    10 years ago

    Thanks

    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 avatar
    pkh
    Moderator
    10 years ago
    If you have 2 tapes in the library then the total capacity would be reported as 2.7Tb
  • CraigV's avatar
    CraigV
    Moderator
    10 years ago

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

    http://en.wikipedia.org/wiki/Linear_Tape-Open

    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.

    Thanks!

  • vovocals's avatar
    vovocals
    Level 4
    10 years ago

    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 avatar
    CraigV
    Moderator
    10 years ago

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

    Thanks!

  • pkh's avatar
    pkh
    Moderator
    10 years ago
    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 avatar
    vovocals
    Level 4
    10 years ago

    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 avatar
    pkh
    Moderator
    10 years ago
    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