How to create *exactly* the same SLICES in different disks
Norberto Meijome
freebsd at meijome.net
Wed Aug 31 07:17:14 GMT 2005
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 at 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 at 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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