On Sat, 2008-06-07 at 17:05 -0400, Mag Gam wrote: > Thanks for the responses all. > > I want RAID 5 but without mirroring. The data is important but not > that important. > I am planning to use LVM. > > If the controller creates a stripe size of 16k, do I need to do > anything special with physical extends (in pvcreate or vgcreate) ? > Do I need to do anything specific when creating a LV? I plan on > striping my LV to create extra spindles. Do I need to create my ext3 > filesystem with any particular settings? I am looking for a optimal > tuning guide with emphasis on performace versus redudancy. If you use hardware raid, the bios of the box, the OS and all applications will not be aware of any of the underlining RAID setup parameters. If you use two RAID5, your OS will only know it will have sda and sdb. On top of this you will put your file system (or lvm) and none of these things will know anything about the hardware. Nothing. Not how many HDs you have, not what scsi bus they are on, not how fast they are. Not even that one of them dies (all though I have seen scsi errors show up in /var/log/messages for one HD failure in a hdwr RAID, go figure). All you need to know at the level of the fs/LVM is you will have two hd. You can not have /boot on lvm (technically you can, but not the version used by etch, lenny or sid) so you will need at least one non-lvm partition. -- Damon L. Chesser damon@damtek.com http://www.linkedin.com/in/dchesser
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