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Preserving existing OpenBSD partition layout during a re-install
1. Preserving an existing OpenBSD partition layout during a re-install
1.1 Description of the problem The OpenBSD 4.6 installation program introduced some nice features, like suggesting a disklabel partition lay-out. But if you have quite some experience in installing previous OpenBSD releases, and intend to keep your own custom lay-out, you may be in for a surprise. Such an experience has been posted in July 2009 in a message to the OpenBSD mailing list, with the subject New disklable doesn"t keep old partitions if requested. A quote from the initial post Code:
I try to keep the actual partition of the disk as it was before and do a fresh install, but the snapshots looks like simply do not allow this now. You can select Custom label and it will show the previous label, but then when you write it, obviously no changes are present, but when you Quit it, it comes back to the same question and looks like you can't move on from there. Good if you want to use the auto label, but if you want to keep the old one, then what really should be the step then? 1.2 Partitioning at MBR level with 'fdisk' step Code:
Available disks are: wd0. Which one is the root disk? (or 'done') [wd0] Enter Disk: wd0 geometry: 19457/255/63 [312581808 Sectors] Offset: 0 Signature: 0xAA55 Starting Ending LBA Info: #: id C H S - C H S [ start: size ] ------------------------------------------------------------------------------- *0: A6 0 1 1 - 4864 254 63 [ 63: 78156162 ] OpenBSD 1: A5 4865 0 1 - 9728 254 63 [ 78156225: 78140160 ] FreeBSD 2: A5 9729 0 1 - 12161 254 63 [ 156296385: 39086145 ] FreeBSD 3: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused Use (W)hole disk, use the (O)penBSD area, or (E)dit the MBR? [OpenBSD] Enter
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