Ultrium 215 LTO 1 Tape

[Ranjith Vasudevan]

I have a HP Ultrium 215 LTO drive (in a rack enclosure).Using Veritas Backup Exec,been doing backups for last few months without any problem.
All these days backup was less than 130 GB, now it's more than 130 GB.Now it has started asking for second tape after completing 125 GB.

Have tried with new tape and tried erasing the old tape, but no luck.Default Hardware copression is enabled.


What could be he coz? will it be related to tape drive or tape ? will it be related to BAckup Exec ?

Thanks

[Richard Bickers]

Hi Ranjth. These drives/tapes have a native capacity of 100 GB so it looks like you're getting a compression ratio of around 1.25:1 with your data.

You can confirm this by pulling a support ticket with L&TT (after the backup has completed) and looking at the drive performance->compression ratio information.

Take a look at our compression troubleshooting for details: http://h41206.www4.hp.com/webapps/IV3/node.iv?locale=en_us&prodSeriesId=238671&node=prodITRC%2FDE_HS_STORAGE_pl3c_EN_01_E%2FN1%7C15%7C28&prodTypeId=12169&serverId=1#src

The 2:1 compression ratio usually quoted is considered an industry average but if you have pre-compressed files (e.g. video, photos, zip files, compressed disks, ...) then your own compression ratio average will be quite a bit lower.

The first thing to do is measure the compression ratio of your data (as above). If you want any futher advice/assessment of your drive then please post your support ticket and we'll take a look.

Richard (HP/LTO/LTT)