On 1/25/07, Nick Jones <[EMAIL PROTECTED]> wrote: > I had a bad tape recently > > I have tried to verify if the tape is good or not, but I've run into > another issue. > > It now wrote the tape fine, and didn't error out at > Bytes=52,398,230,131. However, it wrote way more bytes that what > will fit on the tape. It is a 400 GB LTO-3 tape. > > | 22 | tape7 | Full | 635,479,838,715 | 636 | > 15,552,000 | 1 | 7 | 1 | LTO | 2007-01-25 > 08:52:41 > > Can anyone explain how the drive wrote so much data, or why it *thinks* it > did. > The drive has hardware data compression that saves tape space by compressing each packet sent to the drive. Although the manufacture will claim 2:1 (and call the tape a 800GB tape) is the norm this number is highly dependent on your data. Remember that compressed data does compress a second time and random data is also not compressible but text is very compressible.
BTW (dev team), Is this info in the docs or faq anywhere? I believe I have answered this question 20 times or more .... John ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
