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.