Messages in this thread | | | From | Neil Brown <> | Date | Fri, 21 Jun 2002 12:51:40 +1000 (EST) | Subject | Re: partition md raid? |
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On Wednesday June 19, wt@electro-mechanical.com wrote: > Is this possible (w/o using lvm)
Yes, but you need a patch... http://www.cse.unsw.edu.au/~neilb/patches/linux-stable/ 2.4.19-pre8 section patch-Z-MdLocks Improve locking of MD related structure, particularly when reconfiguring patch-a-RaidSplit Split raid requests that span chunks patch-b-MdPart Enable partitioning of MD devices patch-c-MdpMajor Define a static major number for mdp - partitioned md
These patches should make the first 16 devices partitionable. Without patch-c-MdpMajor, a free major number is allocated (usually 254, but no guarantees) and you have to either: - have a script which finds the number from /proc/devices and makes all the /dev entries, or - use devfs
With patch-c-MdpMajor, Major number "60" (LOCAL/EXPERIMENTAL USE) is allocated for the partitioned md devices.
I use this in production. I have two system discs (sda and sdb, or hda and hdc) which are mirrored together as whole devices, and then this is partitioned: mda1 == root mda2 == swap mda3 == other...
Getting lilo to cope was interesting, but it works.
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