ramdisk for FreeBSD 4.8

Martin Hepworth martinh at solid-state-logic.com
Fri Jan 23 12:22:45 GMT 2004


I'm trying to get a ram disk setup on my 4.8 system. I'm trying to 
replicate the tmpfs filesystem on GNU/Linux, but from what I can see 
FreeBSD ramdisks are a fixed size.

anyway I've done a small one (!) with the following..

1) dd if=/dev/zero of=newimage bs=1k count=5k
2) vnconfig -s labels -c vn0 newimage
3) disklabel -r -w vn0 auto
4) newfs vn0c
5) dd if=newimage of=/dev/md0
6) mount /dev/md0c /mnt

Obviously this is only a 5MB disk and I may need more than the 20MB by 
default (prob around 64MB) so I'll either have to recompile the kernel 
or if I'm lucky sysctl will have the value...Prob be better to recompile 
as  it's not been done so I could comment out a load of drivers..

anyway the thing is, do I need to do item 5 and 6 on the list above when 
rebooting, or can I rely on /etc/fstab to mount on boot?

Martin Hepworth
Snr Systems Administrator
Solid State Logic
Tel: +44 (0)1865 842300


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