Jon, I thought you were in Princeton. Did you move?
--Ian On Friday 25 July 2008 14:03:52 Jon LaBadie wrote: > On Fri, Jul 25, 2008 at 01:18:40PM -0400, Brian Cuttler wrote: > > We have a Solaris E250 amanda server backing up two T1000 servers, > > also Solaris, hosting Lotus Notes. > > > > Over time, we decided on HW compression, runs where long but they > > completed pretty reliably at the same time every day. > > > > We tried an experiment, since we hadn't really tried SW compression > > since we upgraded the client systems, we used SW-client compression > > and removed the HW compression. Runs jumped to 22+ hours, but we where > > not seeing the work area filled (the data was smaller, and it was taking > > longer to get to us). > > > > So I increased the inparallel parameter, which of course ramped up > > the load on the clients even further. > > > > The question of which version of Gzip to run arose, we had a fairly > > old version and there is a newer-Sun version available, just didn't > > know how version sensitive we where. I know version of gzip (which > > we use on some partitons on these clients) is very version specific. > > > > Is there a list of tested/approved gzip versions ? I didn't see one > > but may not have dug deep enough. > > > > Current gzip > > $ /usr/local/bin/gzip -V > > gzip 1.2.4 (18 Aug 93) > > > > Proposed gzip > > $ /usr/bin/gzip -V > > gzip 1.3.5 > > (2002-09-30) > > Copyright 2002 Free Software Foundation > > One thing to check is whether you have specified "best" for your > compression. Gzip allows you to select from 9 levels of compression, > trading cpu time (and wall time) for extra compression. Amanda > allows you to select "fastest" (aka level 1), "best" (level 9) or > default which is level 6. > > I just ran a quick test on an 11MB text only file. Level 9 took > three times as long as level 1. Yet level 1 gave 83% of the compression > of level 9. I like default level 6 which took 1.8 times as long > as level 1 and gave 97% of the compression of level 9. > > BTW I also ran bzip2 on the same file. It did 60% better than gzip > level 9, but took nearly 22 times as long as gzip level 1. -- Wiki for Amanda documentation: http://wiki.zmanda.com/