> I know this isn't the software-raid mailing list, but I was unable to find
> one that is active.
Things are in faq...
> 5 x 80 GB Harddisks
> (4 x on on-board HPT-370 raid controller)
>
Bad idea use slave disk in raid... It spoils performance...
> I am currently using the software raid and I want to change it from just 2
> devices doing 0 to 10 software raid. What steps do I need to take?
>
Using mirror needs 2x disk space, assuming current md-devs don't
containing any important.
1. make disks with two identical size partitions, like hde1 40G, hde2 40G
etc..
2. make mirrors... (mknod more dev-nodes or use devfs)
# mirror 1
raiddev /dev/md0
raid-level 1
chunk-size 64k
persistent-superblock 1
nr-raid-disks 2
device /dev/hde1
raid-disk 0
device /dev/hdg1
raid-disk 1
# mirror 2
raiddev /dev/md1
raid-level 1
chunk-size 64k
persistent-superblock 1
nr-raid-disks 2
device /dev/hdf1
raid-disk 0
device /dev/hdh1
raid-disk 1
# mirror 3
raiddev /dev/md2
raid-level 1
chunk-size 64k
persistent-superblock 1
nr-raid-disks 2
device /dev/hde2
raid-disk 0
device /dev/hdg2
raid-disk 1
# mirror 4
raiddev /dev/md3
raid-level 1
chunk-size 64k
persistent-superblock 1
nr-raid-disks 2
device /dev/hdf2
raid-disk 0
device /dev/hdh2
raid-disk 1
# stripe 1
raiddev /dev/md4
raid-level 0
chunk-size 64k
persistent-superblock 1
nr-raid-disks 2
device /dev/md0
raid-disk 0
device /dev/md1
raid-disk 1
# stripe 2
raiddev /dev/md5
raid-level 0
chunk-size 64k
persistent-superblock 1
nr-raid-disks 2
device /dev/md2
raid-disk 0
device /dev/md3
raid-disk 1
You got md4 and md5 final raid-devs. Don't use md0-3 devs. There might be
broblem with raid autodetect, mirrors come up in boot, but final 1+0 dosnt
because there is not correct partiton id (0xfd ?) in md-dev.
(maybe some boot args?)
Another way is do same with LVM, it might do 1+0 and autoboot up. Need
special lilo to boot from LVM...
> current raidtab
> ---------------
>
> raiddev /dev/md0
> raid-level 0
> chunk-size 64k
> persistent-superblock 1
>
> nr-raid-disks 2
> device /dev/hde1
> raid-disk 0
> device /dev/hdf1
> raid-disk 1
> raiddev /dev/md1
> raid-level 0
> chunk-size 64k
> persistent-superblock 1
>
> nr-raid-disks 2
> device /dev/hdg1
> raid-disk 0
> device /dev/hdh1
> raid-disk 1
>
>
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