On Fri, Feb 07, 2003 at 07:46:59AM -0500, Joshua Baker-LePain wrote: > Note, also, that your length is probably rather optimistic. I've rarely > seen hardware compression get the 2X most manufacturers claim (and the > 2.6X Sony claims for AIT is truly laughable). Only you know how > compressible your data is, but if amanda keeps banging into EOT, you're > going to want to back off on your length.
Good advice. FWIW, LTO HW compression *does* seem to be pretty good, though; far better than DLT-4000/7000 and EXB-8500 hardware I've used in the past (no experience with SDLT or AIT). Last time I ran a capacity/speed check on my LTO drive using my /home partition, I got 216GB on a 100GB native tape. This is a pretty standard IC engineering /home, lots of e-mail, program source, executable objects, Verilog source, with a sprinkling of (uncompressible) gzipped tarballs and simulator waveform output. On my /project partition (full of Cadence dfII chip database, highly compressible) it did 249GB. I use 166GB for my (HW compression) tapetype length; I *hate* hitting EOT. -- Jay Lessert [EMAIL PROTECTED] Accelerant Networks Inc. (voice)1.503.439.3461 Beaverton OR, USA (fax)1.503.466.9472
