2008/9/25 Joshua Baker-LePain <[EMAIL PROTECTED]>: > On Thu, 25 Sep 2008 at 4:42pm, Jamie Penman-Smithson wrote > >> The holding disk is on a local [lowly] IDE drive. The data being >> backed up is on the whole comprised relatively large (couple of gig) >> files stored on SAN over fibre. At first I thought that the adverse > > Have you benchmarked the SAN from this host independent of amanda? Try > something like bonnie++ or even just 'tar cO /foo | cat > /dev/null'.
$ time sudo tar cO /foo | cat > /dev/null real 12m59.903s user 0m24.795s sys 2m48.930s >> performance was due to the IDE disk, however after disabling the >> holding disk it actually takes 4 hours longer to complete. I've > > If you can't read from the SAN fast enough to keep the tape streaming, then > it *would* take even longer without a holding disk. What I can't understand is how using tar -cvf /dev/st0 /foo (without using mbuffer for example) takes around 3-4 hours to fill a 200 GB tape.. <snip> >> The tape drive is part of an IBM TotalStorage 3582 tape library. > > LTO1? Yes. Thanks, -- -Jamie L. Penman-Smithson <[EMAIL PROTECTED]>
