On Tue, 25 Sep 2007 14:21:44 -0700, Kelly Byrd <kbyrd@memcpy.com> wrote: > > > On Tue, 25 Sep 2007 16:26:30 -0500, Chris Cox <chris_cox@stercomm.com> > wrote: >> Kelly Byrd wrote: >>> >>> >>> On Sat, 22 Sep 2007 18:36:41 -0700, Kelly Byrd <kbyrd-lvm@memcpy.com> >>> wrote: >>>> Two questions really: >>>> >>>> I'm going to use lvm to partition up 4 equal size partitions. >>>> I can either use the md driver to RAID0 them the make /dev/md0 >>>> my PV, or just use the 4 partitions as PVs and stripe across >>>> them. >>>> >>>> How does lvm2 striping compare with md's RAID0 as far as speed? >>>> I don't quite get how it stripes on chunk sizes smaller than >>>> a PE, but a 4MB stripe size seems crazy. >>>> >>>> Finally, what's the tuning advice for LVM2 striping? I usually >>>> create my RAID0 or RAID5 with 128k chunk sizes, is it similar >>>> for LVM2 striping? >>>> >>>> >>> >>> anyone? >> >> This is merely my own opinion, but md was designed to be >> THE software raid mechanism. So, my preference would be >> to establish a RAID md device and make that into a PV. >> >> Of course, I don't believe in non-RAID (i.e. RAID0) anyhow. >> Maybe someone else will chime in on this one. >> >> > I had the same thought, but there's also this instinct that 'one less layer between my files and this physical disk is better'. I'm really hoping someone will say something like: 'LVM2 striping uses the same code as md raid0' or some other silly thing. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
