On Sun, Jan 28, 2007 at 12:14:00PM +0100, christian widmer wrote: > On Sunday 28 January 2007 11:02, Patrick Useldinger wrote: > > I am currently experimenting with ccd(4) and although it appears to > > work, I am uncomfortable with one point. > > > > I have configured 2 partitions as a JBOD (interleave 0). However, the > > first of these partitions is partition 'a' of one disk. So the first > > effect I had was that ccd0 appeared to have the same disklabel as the > > first disk. > > man ccd: > "Note that the `raw' partitions of the disks should not be combined. Each > component partition should be offset at least one cylinder from the beginning > of the component disk." > > see also thread on misc: > CCD: started on 17 jan 2007 by Chris Mika > > > how much one cylinder is, can be calculated with the numbers given by > disklabel. ight about the following point but: > i would not use partition 'a' for anything else then my boot partition. > thus i never used 'a' as a member of a ccd, nor did i create an 'a' on > a ccd. > > unfortunatly disklabel -E ccd0 did not work for me after 'fdisk -i ccd0', > since 'ccd0c' had type '4.2BSD' not 'unused' as for raw devices. since the
What version of OpenBSD are you using? On -current ccd0c should no longer appear as 4.2BSD. .... Ken > FAQ sais: > "Just use disklabel on it like you normally would to make the partition or > partitions you want to use. Again, don't use the 'c' partition as an actual > partition that you put stuff on." > i used 'disklabel -e ccd0' to change the type to 'unused'. after that i > created one big partition 'd' on the ccd0 drive. > > //llx > > > > > I read through the mailing list archives and found a thread explaining > > that the disklabel is stored around the beginning of partition 'a' and > > that one should allocate a small partition 'a' which should not be made > > part of the JBOD. > > > > What I am uncomfortable with is that > > > > 1) this does not appear to be documented in the man pages anywhere > > > > 2) that the size and position of the disklabel of partition 'a' is not > > clearly stated anywhere so that I can be certain that it doesn't get > > overwritten and that I am not wasting too much space. > > > > Can anybody please shed some light on this? > > > > Regards, > > -pu
