On Tuesday 15 Oct 2013 20:28:46 Paul Hartman wrote: > On Tue, Oct 15, 2013 at 2:34 AM, Mick <michaelkintz...@gmail.com> wrote: > > Hi All, > > > > I haven't had to set up a software RAID for years and now. I want to set > > up two RAID 1 arrays on a new file server to serve SBM to MSWindows > > clients. The first RAID1 having two disks, where a multipartition OS > > installation will take place. The second RAID1 having two disks for a > > single data partition. > > > > From what I recall I used mdadm with --auto=mdp, to create a RAID1 from 2 > > disks, before I used fdisk to partition the new /dev/md0 as necessary. > > All this is lost in the fog of time. Now I read that these days udev > > names the devices/partitions, so I am not sure what the implication of > > this is and how to proceed. > > > > What is current practice? Create multiple /dev/mdXs for the OS > > partitions I would want and then stick a fs on each one, or create one > > /dev/md0 which thereafter is formatted with multiple partitions? > > Grateful for any pointers to resolve my confusion. > > One of the best resources is the kernel RAID wiki: > https://raid.wiki.kernel.org/
Thanks Paul! It seems that after a cursory look, both ways of partitioning a RAID-1 are still available: https://raid.wiki.kernel.org/index.php/Partitioning_RAID_/_LVM_on_RAID ======================================================== # df -h Filesystem Size Used Avail Use% Mounted on /dev/md2 3.8G 640M 3.0G 18% / /dev/md1 97M 11M 81M 12% /boot /dev/md5 3.8G 1.1G 2.5G 30% /usr /dev/md6 9.6G 8.5G 722M 93% /var/www /dev/md7 3.8G 951M 2.7G 26% /var/lib /dev/md8 3.8G 38M 3.6G 1% /var/spool /dev/md9 1.9G 231M 1.5G 13% /tmp /dev/md10 8.7G 329M 7.9G 4% /var/www/html ========================================================= and: mdadm --create --auto=mdp --verbose /dev/md_d0 --level=mirror --raid-devices=2 /dev/sda /dev/sdb which is thereafter partitioned with fdisk. This is the one I have used in the past. Which one is preferable, or what are the pros & cons of each? -- Regards, Mick
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