Date: Tue, 8 Dec 2009 12:36:54 -0600 From: Peter Steele <psteele@maxiscale.com> To: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: How do I create large partitions in FreeBSD? Message-ID: <7B9397B189EB6E46A5EE7B4C8A4BB7CB33D0D44A@MBX03.exg5.exghost.com>
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We have 3U systems with 3Ware raid controllers configured to give us large =
11TB logical drives. The diskinfo command shows this:
# diskinfo -v da1
da1
512 # sectorsize
11999933104128 # mediasize in bytes (11T)
23437369344 # mediasize in sectors
1458908 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Y08210901E792700BAB9 # Disk ident.
We want to create a BSD slice to cover the entire drive. My plan was to use=
the fdisk -I option:
# fdisk -I da1
******* Working on device /dev/da1 *******
fdisk: Class not found
# fdisk -p da1
# /dev/da1
g c1458908 h255 s63
p 1 0xa5 63 1962532467
a 1
but as you can see, the partition size that this creates is only 1TB (19625=
32467*512=3D1004816623104 bytes). The fdisk command clearly knows how large=
the disk really is:
# fdisk da1
******* Working on device /dev/da1 *******
parameters extracted from in-core disklabel are:
cylinders=3D1458908 heads=3D255 sectors/track=3D63 (16065 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=3D1458908 heads=3D255 sectors/track=3D63 (16065 blks/cyl)
If I compute 1458908*255*63*512 this gives me 11999926794240, which is the =
correct size. But the -I option doesn't create a full sized partition.
How do we resolve this? We want a full size partition spanning the entire d=
isk, and we need a scriptable solution since the configuration of these ser=
vers is handled through an automated process.
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