Hello,
What does the cpg (cylinders per group) field in a disk label do?
The original factory written label had value of 12 cylinders per group
for the 'c' partition. I used the same value for other partitions
when I repartitioned the drive.
But when I make a filesystem I get the following warnings:
# /usr/sbin/newfs /dev/rrz18f
Warning: /dev/rrz18f is marked in use for 4.2BSD in the disklabel.
If you continue with the operation you can
possibly destroy existing data.
CONTINUE? [y/n] y
Warning: Block size restricts cylinders per group to 12.
Warning: 1460 sector(s) in last cylinder unallocated
/dev/rrz18f: 11796480 sectors in 1793 cylinders of 28 tracks, 235 sectors
5760.0MB in 150 cyl groups (12 c/g, 38.55MB/g, 9216 i/g)
super-block backups (for fsck -b #) at:
32, 79232, 158432, 237632, 316832, 396032, 475232, 554432, ...
11374112, 11453312, 11532512, 11611712, 11690912, 11770112,
(The man page for newfs says the 'sectors unallocated' warning
requires no user action and doesn't mean space is being wasted.)
So I am wondering if I should change the cpg parameter in the label
and make a new filesystem.
Any advice would be greatly appreciated.
Thanks,
dancing-bear_at_earthling.net
PS: Below find the new partition table and the full original label.
----- New Partition Table -----
8 partitions:
# size offset fstype [fsize bsize cpg]
a: 131072 0 4.2BSD 1024 8192 12 # (Cyl. 0 - 19*)
b: 786432 131072 swap # (Cyl. 19*- 139*)
c: 45322644 0 unused 0 0 # (Cyl. 0 - 6887*)
d: 7864320 917504 4.2BSD 1024 8192 12 # (Cyl. 139*- 1334*)
e: 11796480 8781824 4.2BSD 1024 8192 12 # (Cyl. 1334*- 3127*)
f: 11796480 20578304 4.2BSD 1024 8192 12 # (Cyl. 3127*- 4920*)
g: 8388608 32374784 4.2BSD 1024 8192 12 # (Cyl. 4920*- 6195*)
h: 4559252 40763392 4.2BSD 1024 8192 12 # (Cyl. 6195*- 6887*)
----- Original Label -----
# /dev/rrz18c:
type: SCSI
disk: ST423451
label:
flags: dynamic_geometry
bytes/sector: 512
sectors/track: 235
tracks/cylinder: 28
sectors/cylinder: 6580
cylinders: 6876
sectors/unit: 45322644
rpm: 5400
interleave: 1
trackskew: 20
cylinderskew: 65
headswitch: 0 # milliseconds
track-to-track seek: 0 # milliseconds
drivedata: 0
8 partitions:
# size offset fstype [fsize bsize cpg]
a: 131072 0 unused 1024 8192 # (Cyl. 0 - 19*)
b: 262144 131072 unused 0 0 # (Cyl. 19*- 59*)
c: 45322644 0 4.2BSD 1024 8192 12 # (Cyl. 0 - 6887*)
d: 0 0 unused 0 0 # (Cyl. 0 - -1)
e: 0 0 unused 0 0 # (Cyl. 0 - -1)
f: 0 0 unused 0 0 # (Cyl. 0 - -1)
g: 22464714 393216 unused 0 0 # (Cyl. 59*- 3473*)
h: 22464714 22857930 unused 0 0 # (Cyl. 3473*- 6887*)
----------
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Received on Mon Nov 02 1998 - 20:12:19 NZDT