On Wednesday 05 June 2002 12:42 pm, Kenny MacPherson wrote: >Can AMANDA on the whole only backup < 24GB partitions or is this a > tape limitation in this case? > >I have a /home5 partition on a DELL 4400 running RH7.2 and it's > failing daily! Other partitions do backup okay. The only issue is > that I have a Mammoth-2/EZ17 and even when I snip my disklist down to > this directory alone, it fails to complete a backup. > >It's 55GB and AFAICT the M2 should eat that kind of space up no > problem. It's set for nocomp-high as Exabyte tell me the EZ17 always > has hardware compression on!
Generally speaking, the hardware compression in a tape drive just isn't up to the same compression standards as external programs such as gzip et all can do. Also, data which has already been smunched as an archive will often expand quite a bit when presented to the drives compressor. Your best bet to settle the argument at your site is to turn the drives hardware compression off, then run the tapetype program against your standard tape and find out how big the drive really is when being fed data from /dev/urandom. That data is virtually uncompressable. Then set that size -5% or so in the tapetype specifier in amanda.conf, and turn on the 'client best' or 'server best' options by choosing a backup type in the disklist that uses one or the other of those options. BTW, what is the advertized rated capacity of the EZ17? -- Cheers, Gene
