Hi there.
I'm fairly new to openbsd and I'm hoping someone with better
understanding than me of how its disk handling works can help.
Beginning my effort to encrypt a 300GB drive in a 64bit Ultrasparc,
I followed these initial steps:
1. used disklabel to create a single slice "a" on the drive
2. made a file system with newfs (is it necessary to have so many
backup superblocks?)
3. mounted sd2a on "/home/cy" and touched it with an empty file
"/home/cy/cryptfile"
4. zeroed out the file (and efectively the drive) with
"dd if=/dev/zero of=/home/cy/cryptfile bs=512"
Here's the (eventual!) output of (4):
/home/cy: write failed, file system is full
dd: /home/cy/cryptfile: No space left on device
576520353+0 records in
576520352+0 records out
295178420224 bytes transferred in 19810.722 secs (14899932 bytes/sec)
Now I have:
# disklabel sd2a
# /dev/rsd2a:
type: SCSI
disk: SCSI disk
label: MAW3300NC
flags: vendor
bytes/sector: 512
sectors/track: 930
tracks/cylinder: 8
sectors/cylinder: 7440
cylinders: 13217
total sectors: 585937500
rpm: 10025
interleave: 1
boundstart: 0
boundend: 585937500
drivedata: 0
16 partitions:
# size offset fstype [fsize bsize cpg]
a: 585937200 0 4.2BSD 2048 16384 1
c: 585937500 0 unused
and:
# ls -l /home/cy
total 576661216
-rw-r--r-- 1 root wheel 295178420224 Jun 16 03:39 cryptfile
and:
# df -h
Filesystem Size Used Avail Capacity Mounted on
/dev/sd0a 1007M 44.8M 912M 5% /
/dev/sd0k 247G 2.0K 235G 0% /home
/dev/sd0d 3.9G 6.0K 3.7G 0% /tmp
/dev/sd0f 2.0G 559M 1.3G 29% /usr
/dev/sd0g 1007M 162M 795M 17% /usr/X11R6
/dev/sd0h 5.9G 212K 5.6G 0% /usr/local
/dev/sd0j 2.0G 2.0K 1.9G 0% /usr/obj
/dev/sd0i 2.0G 2.0K 1.9G 0% /usr/src
/dev/sd0e 7.9G 7.7M 7.5G 0% /var
/dev/sd2a 275G 275G -13.7G 105% /home/cy
I have no understanding of this. I've never seen a df output
that tells me I'm using 13GB more space than the drive is
capable of holding.
I ask here because there's obviously potential for me to lose
data somewhere down the line. I'll be grateful if anyone can
explain where I've gone wrong.
