01-09-2006
Problem re-formatting Disk Partition
I have a disk formatted as follows.
Part Flag Tag Cylinders Size
===================================================
0 wm root 0 - 38125 26.18 Gb
1 wu swap 38126 - 49776 8 Gb
2 wm backup 0 - 49779 34.18 Gb
3 wm unassigned
4 wm unassigned
5 wm unassigned
6 wm unassigned
7 wm home 49777- 49779 2.11 Mb
Note none of the above slices have been mounted nor do they contain any data.
First question - what is the significance of the Tag's ? What does the root, backup and home tags signify ?
I want to reorganise the slices as such
Part Flag Tag Cylinders Size
=================================================
0 wm usr 0 - 38108 26.17 Gb
1 wu swap 38126 - 49776 8 Gb
2 wm backup 0 - 49779 34.18 Gb
3 wm unassigned 0 0
4 wm unassigned 0 0
5 wm unassigned 0 0
6 wm usr 38109 - 38125 11.95 Mb
7 wm home 49777- 49779 2.11 Mb
i.e. basically create Slice 6 with a bit of space previously belonging to Slice 7
I save the partition mapping. However when I try to recreate the filesystems for slices 6 & 7 ( using newfs /dev/rdsk/c0t1d0s6 and c0t1d0s7 ), Slice 7 completes ok but for Slice 6, I get the following :
warning inode blocks/cyl group (134) >= data blocks (90) in last cylinder group. This implies 1440 sector(s) cannot be allocated
/dev/rdsk/c0t1d0s6: 23040 sectors in 16 cylinders of 2 tracks
Even when I reorganise the entire disk to have contiguous use of Cylinders i.e.
Part Flag Tag Cylinders Size
==================================================
0 wm usr 0 - 38108 26.17 Gb
1 wm unassigned 0 0
2 wm backup 0 - 49779 34.18 Gb
3 wm unassigned 0 0
4 wm unassigned 0 0
5 wm unassigned 0 0
6 wm usr 38109 - 38125 11.95 Mb
7 wu swap 38126 - 49776 8Gb
and then use newfs to recreate the file system for Slices 6 & 7. Again the FS for Slice 7 creates ok but for Slice 6 I get the same error as before
warning inode blocks/cyl group (134) >= data blocks (90) in last cylinder group. This implies 1440 sector(s) cannot be allocated
/dev/rdsk/c0t0d0s6: 23040 sectors in 16 cylinders of 2 tracks, 720 sectors
11.2 MB in 1 cyl groups ( 16 c/g 11.25Mb/g, 5540 i/g )
Super-block backups ( for fsck -F ufs -o b=# ) at : 32,
Also When I use the MODIFY partition option under the FORMAT command, I get the warning :
Warning: overlapping partition (6) in table
I don't understand this, since clearly from my mappings above, the cylinders are not overlapping ?
Any idea of what is going on ?
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LEARN ABOUT FREEBSD
disktab
DISKTAB(5) BSD File Formats Manual DISKTAB(5)
NAME
disktab -- disk description file
SYNOPSIS
#include <disklabel.h>
DESCRIPTION
Disktab is a simple database which describes disk geometries and disk partition characteristics. It is used to initialize the disk label on
the disk. The format is patterned after the termcap(5) terminal data base. Entries in disktab consist of a number of `:'-separated fields.
The first field for each entry gives the names by which a disk's entry may be selected, separated by `|' characters. The last name given
should be a long name fully identifying the disk.
The optional fields for each entry are:
ID Type Description
ty str Type of disk (e.g. removable, winchester)
dt str Type of controller (e.g. SMD, ESDI, floppy)
ns num Number of sectors per track
nt num Number of tracks per cylinder
nc num Total number of cylinders on the disk
sc num Number of sectors per cylinder, ns*nt default
su num Number of sectors per unit, sc*nc default
se num Sector size in bytes, DEV_BSIZE default
sf bool Controller supports bad144-style bad sector forwarding
rm num Rotation speed, rpm, 3600 default
sk num Sector skew per track, default 0
cs num Sector skew per cylinder, default 0
hs num Headswitch time, usec, default 0
ts num One-cylinder seek time, usec, default 0
il num Sector interleave (n:1), 1 default
d[0-4] num Drive-type-dependent parameters
bs num Boot block size, default BBSIZE
sb num Superblock size, default 0
ba num Block size for partition `a' (bytes)
bd num Block size for partition `d' (bytes)
be num Block size for partition `e' (bytes)
bf num Block size for partition `f' (bytes)
bg num Block size for partition `g' (bytes)
bh num Block size for partition `h' (bytes)
fa num Fragment size for partition `a' (bytes)
fd num Fragment size for partition `d' (bytes)
fe num Fragment size for partition `e' (bytes)
ff num Fragment size for partition `f' (bytes)
fg num Fragment size for partition `g' (bytes)
fh num Fragment size for partition `h' (bytes)
oa num Offset of partition `a' in sectors
ob num Offset of partition `b' in sectors
oc num Offset of partition `c' in sectors
od num Offset of partition `d' in sectors
oe num Offset of partition `e' in sectors
of num Offset of partition `f' in sectors
og num Offset of partition `g' in sectors
oh num Offset of partition `h' in sectors
pa num Size of partition `a' in sectors
pb num Size of partition `b' in sectors
pc num Size of partition `c' in sectors
pd num Size of partition `d' in sectors
pe num Size of partition `e' in sectors
pf num Size of partition `f' in sectors
pg num Size of partition `g' in sectors
ph num Size of partition `h' in sectors
ta str Partition type of partition `a' (4.2BSD file system, swap, etc)
tb str Partition type of partition `b'
tc str Partition type of partition `c'
td str Partition type of partition `d'
te str Partition type of partition `e'
tf str Partition type of partition `f'
tg str Partition type of partition `g'
th str Partition type of partition `h'
FILES
/etc/disktab
SEE ALSO
getdiskbyname(3), bsdlabel(8), newfs(8)
HISTORY
The disktab description file appeared in 4.2BSD.
BSD
October 14, 2006 BSD