On 7/23/2010 10:42 PM, Daniel O'Connor wrote:
On 24/07/2010, at 11:55, Freddie Cash wrote:
It's theoretical as I have not investigated how to create sparse files
on FreeBSD, nor have I done this. It's based on several posts to the
zfs-discuss mailing list where several people have done this on
OpenSolaris.
FYI you would do..
truncate -s 1T /tmp/fake-disk1
mdconfig -a -t vnode -f /tmp/fake-disk1
etc..
Although you'd want to determine the exact size of your real disks from geom
and use that.
$ dd if=/dev/zero of=/tmp/sparsefile1.img bs=1 count=0 oseek=2000G
0+0 records in
0+0 records out
0 bytes transferred in 0.000025 secs (0 bytes/sec)
$ ls -l /tmp/sparsefile1.img
-rw-r--r-- 1 dan wheel 2147483648000 Jul 23 22:49 /tmp/sparsefile1.img
$ ls -lh /tmp/sparsefile1.img
-rw-r--r-- 1 dan wheel 2.0T Jul 23 22:49 /tmp/sparsefile1.img
--
Dan Langille - http://langille.org/
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