Re: How to create *exactly* the same SLICES in different disks

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

  • Next message: Lyubich, M: "Re: Is there a way to connect to a Microsoft VPN?" 
    Date: Wed, 31 Aug 2005 17:17:08 +1000
To: FreeBSD Questions <freebsd-questions@freebsd.org>

    sorry, i meant slices. i need 2 slices, exactly the same size on each of
    4 disks.

    Norberto Meijome wrote:
    > 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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