On Wed, Aug 20, 2008 at 10:01:10AM +0200, Christophe Rioux wrote: > I follow some documentation for building the software raid on my system: > http://www.argon18.com/raid_openbsd.html > http://www.openbsd-france.org/documentations/OpenBSD-raid1.html#deux > > And the result is, I have 2 disk which are working in RAID-1. I build > following configuration: > > Physical disk: 250 Go (2 x) > > Disklabel: wd0 and wd1 > wdXa: 10 Gb > wdXb: 512m > wdXd: the rest of the disk > > => as far I undestand, the wdXa disk are needed to boot before starting the > RAID. This are more or less lost disk place ? >
Yes. 10 GByte is more than sufficient for building the RAID kernel. I have done it in 1.5 GByte, but that was maybe pushing it a bit far... > > I build again the same disklabel on the raid0 disk: > a: 20971853 235680435 4.2BSD 2048 16384 1 > b: 1048576 256652288 swap > c: 466350720 0 unused 0 0 > d: 208649856 257700864 4.2BSD 2048 16384 1 > i: 1000974 136512000 MSDOS > j: 4017 235676418 unknown > > But the result is: > a: 10 Gb > d: 100 Gb > i ???? > j ???? What result is? How did you build the disklabel? What is the actual printout from "disklabel -p m raid0"? Oh, and "disklabel -p m wd0", and "disklabel -p m wd1" What does "raidctl -s all" say? > > When I start the system, I have the feeling that I'm booting on the wd0a > disk, and not on the raid0a disk > You need to make the RAID auto-configurable, and root partition eglible. I.e "raidctl -A yes raid0" and "raidctl -A root raid0". Read "man raidctl", all the way down to the end. It is invaluable. > Questions: > * how can I be sure I'm booting on the right disk ? Check your dmesg and see which root device it uses at the end. > * where are my 130 Gb lost place ? You can probably find them in the disklabels. > * where will the system write the logs down ? Wd0a or raid0a ? If those > information are writing to raid0a, that means, I can reduce the wdXa disk to > the minimum requirements (1 Gb for example) > > Christophe -- / Raimo Niskanen, Erlang/OTP, Ericsson AB
