... SNIP ... > >What if the I broke everything into 10 GB pieces, and > created multiple > >raid5 sets? Then I could LVM2 them together and have a large > >filesystem that way. > > > >a=20GB, b=30GB, c=40GB > > > >a-1 + b-1 + c-1 = md0 (approx 30 GB storage) > >a-2 + b-2 + c-2 = md1 (approx 30 GB storage) > > b-3 + c-3 = md2 (waiting for one more drive) > > c-4 = md3 (waiting for two more drives) > > > > > This is sorta what I do. But in my opinion the gain of having RAID5 > (over RAID1) is when you get over 3 disks... at 3 disks you > are burning > 33% for redudnacy... 25% or 20% or 17% sounds better to me. > I guess if > you go too far it costs in calculating the parity. Overhead: Yea, OK. Nothing is without a price. I fooled around with various ideas, and came up with this for my particulars: (Note, rounded to nearest GB) 80 GB /dev/hda 60 GB /dev/hdb 40 GB /dev/hdc 45 GB /dev/hdd GB /dev/md0 (RAID0) 40 /dev/hdc 15 /dev/hda1 55 /dev/md1 (RAID0) 45 /dev/hdd 10 /dev/hda2 55 /dev/md2 (RAID5) 55 /dev/md0 55 /dev/md1 55 /dev/hda3 55 /dev/hdb 220 Yea, OK, so like the 220 is a bit optimistic, but should get pretty close to that. What do you think? _______________________________________________ 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/
