How do I get remove from this?

Thank you,

Daniel Erlenbusch, Network Administrator, MCSE
PENRAD Imaging
Work - 719-867-7910
Desk - 719-867-6936
Cell - 719-310-4745


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Scott McCambly
Sent: Thursday, December 09, 2010 10:26 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] ULTRIUM4C but not 1.6TB

This is related to a similar question I have been investigating on 3592
media:   Why would you ever get less than the native capacity of a
tape?

Does writing compressed data to tape with hardware compression enabled
result in the data expanding?

I always assumed that the hardware compression mechanism would have
something equivalent to "CompressAlways=NO" and detect already
compressed data in its input buffer, however we backup a number of
already compressed file formats and often see FULL tapes with estimated
capacities from 5 to 20% less than the stated native (uncompressed)
capacity.

Can anyone confirm this?

Thanks.
 
On Thu, 9 Dec 2010 16:30:18  0100, Hans Christian Riksheim  wrote:
If a LTO4 tape holds more than 800GB compression is on.
  >
  > At our place, file data only has a 1.1:1 compression while Oracle data and
  > mail is 2.5:1. Overall it is 2:1.
  >
  > Hans Chr.
  >
  >
  > On Thu, Dec 9, 2010 at 9:18 AM, Mehdi Salehi <ezzobad AT gmail DOT com> 
wrote:
  >
  > > Hi,
  > > Drives are LTO4, devclass is ULTRIUM4C, but all "Full" volumes
are between
  > > 800GB to 1TB. Is it normal? It seems TSM does not use compression.
  > >
  > > Mehdi
  > >
  >
  >