Sooner or later, you will most likely run out of disk space and you will want to extend the disk, either by adding a physical disk or by adding more disk space to a VMware installation. Both are fairly easy to deal with.
When the disk gets added, it will show up in the server as either sdN (SCSI) or wdN (IDE) where N is the disk number where the first disk is 0, then 1, then 2, and so on. Please type the following on the command line to see all physically installed disks
egrep "^(sd|wd)[0-9]+\:" /var/run/dmesg.boot
which will display an output like the following
wd0: 64-sector PIO, LBA, 8192MB, 16777216 sectors wd1: 64-sector PIO, LBA, 20480MB, 41943040 sectors sd0: 20480MB, 2610 cyl, 255 head, 63 sec, 512 bytes/sec, 41943040 sec total
On this system, there's three disks. Two IDE disks (wd0 and wd1) and one SCSI disk (sd0).
The system is installed on wd0, lets use sd0 as the new data disk.
Format the disk with
newfs /dev/rsd0c
Which will display something like this
/dev/rsd0c: 20480.0MB in 41943040 sectors of 512 bytes 102 cylinder groups of 202.47MB, 12958 blocks, 25984 inodes each super-block backups (for fsck -b #) at: 32, 414688, 829344, 1244000, 1658656, 2073312, 2487968, 2902624, 3317280, 3731936, 4146592, 4561248, 4975904, 5390560, 5805216, 6219872, 6634528, 7049184, 7463840, 7878496, 8293152, 8707808, 9122464, 9537120, 9951776, 10366432, 10781088, 11195744, 11610400, 12025056, 12439712, 12854368, 13269024, 13683680, 14098336, 14512992, 14927648, 15342304, 15756960, 16171616, 16586272, 17000928, 17415584, 17830240, 18244896, 18659552, 19074208, 19488864, 19903520, 20318176, 20732832, 21147488, 21562144, 21976800, 22391456, 22806112, 23220768, 23635424, 24050080, 24464736, 24879392, 25294048, 25708704, 26123360, 26538016, 26952672, 27367328, 27781984, 28196640, 28611296, 29025952, 29440608, 29855264, 30269920, 30684576, 31099232, 31513888, 31928544, 32343200, 32757856, 33172512, 33587168, 34001824, 34416480, 34831136, 35245792, 35660448, 36075104, 36489760, 36904416, 37319072, 37733728, 38148384, 38563040, 38977696, 39392352, 39807008, 40221664, 40636320, 41050976, 41465632, 41880288,
This will prepare all the new disk for use with the appliance. Please see Install the OpenBSD FAQ for a more in depth discussion on disks and partitions.
First you have to shut down the services so that nothing will access any of the relevant files.
god stop mailserver
Preserve the original files and mount the new disk
mv /var/mailserver /var/mailserver.old mkdir /var/mailserver mount /dev/sd0c /var/mailserver
Copy all the files to the new filesystem
tar cfp - -C /var/mailserver.old . | tar xvfp - -C /var/mailserver
All that is left to do now is to make sure that the new disk gets mounted on boot and restart all the services
echo "/dev/sd0c /var/mailserver ffs rw,softdep 2 2" >> /etc/fstab
and restart the server.
reboot
You now have some fresh disk space for the appliance, and when you've verified that all the files are intact, you can delete the /var/mailserver.old directory.