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On Tuesday 22 July 2008 20:51, Simon Waters wrote: > Rob Beard wrote: > > You could try hdparm -t /dev/sdX (where X is the letter of the device > > name). That'll give you read performance details. > > hdparm is great for basic checks and tuning. And will do a little more > than just read performance with tweaking. > > Where you want a little bit more, for a little more effort, bonnie++ > will report on different types of I/O. Of course this assumed you have a > file system etc. Where performance matters I run bonnie++ after > installation, and after all relevant I/O subsystem changes (new disks, > new kernels), and put the notes in my server documentation. It can be > very revealing! > > Extra swap space? I use any spare(?) disk space for back up copies of > stuff. Swap space for me is a little bit of space so the kernel can page > out idle pages, to expand the disk cache a little. On most systems a few > 100MB is more than enough swap space even with modern bloatware. Sometime I go mad and do some V large scientific type things - a simulation of some of my electronic designs can easily go to 2 or 3 GB and with only 1G of ram disk speed is the make or break factor in completing a run! Tom te tom te tom -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html