How to create *exactly* the same partitions in different disks

From: Norberto Meijome (numard_at_meijome.net)
Date: 08/31/05

  • Next message: Svein Halvor Halvorsen: "Re: rsync and moving files [Re: backup w/ snapshots]" 
    Date: Wed, 31 Aug 2005 17:07:33 +1000
To: FreeBSD Questions <freebsd-questions@freebsd.org>

    Hi,
    pretty simply, how do I create slices (fdisk) that are exactly the same
    throughtout different drives so they can be used in a RAID5 config?

    I tried using sysinstall and typing the SAME values but they result is
    always slightly off. I tried passing the values by hand, but it changes
    it anyway.

    # echo "p 2 165 20964825 467427240" | fdisk -v -f- /dev/ad6
    ******* Working on device /dev/ad6 *******
    fdisk: WARNING: adjusting size of partition 2 from 467427240 to 467426295
        to end on a cylinder boundary
    parameters extracted from in-core disklabel are:
    cylinders=484521 heads=16 sectors/track=63 (1008 blks/cyl)

    Figures below won't work with BIOS for partitions not in cyl 1
    parameters to be used for BIOS calculations are:
    cylinders=484521 heads=16 sectors/track=63 (1008 blks/cyl)

    Information from DOS bootblock is:
    1: sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
        start 63, size 20964321 (10236 Meg), flag 0
            beg: cyl 0/ head 1/ sector 1;
            end: cyl 317/ head 15/ sector 63
    2: sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
        start 20964825, size 467426295 (228235 Meg), flag 0
            beg: cyl 318/ head 7/ sector 1;
            end: cyl 162/ head 15/ sector 63
    3: <UNUSED>
    4: <UNUSED>
    fdisk: Geom not found

    [root@cerberus] [Wed Aug 31 17:02:10 2005]
    ~
    # fdisk -s /dev/ad4
    /dev/ad4: 484521 cyl 16 hd 63 sec
    Part Start Size Type Flags
       1: 63 20964762 0xa5 0x80
       2: 20964825 467427240 0xa5 0x00

    [root@cerberus] [Wed Aug 31 17:01:35 2005]
    ~
    # fdisk -s /dev/ad6
    /dev/ad6: 484521 cyl 16 hd 63 sec
    Part Start Size Type Flags
       1: 63 20964321 0xa5 0x00
       2: 20964825 467426295 0xa5 0x00

    Help!!!

    thanks in advance,
    beto
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