On Sun, Jul 10, 2011 at 11:16:02PM +0700, Fajar A. Nugraha wrote:
> On Sun, Jul 10, 2011 at 10:10 PM, Gary Mills <mi...@cc.umanitoba.ca> wrote:
> > The `lofiadm' man page describes how to export a file as a block
> > device and then use `mkfs -F pcfs' to create a FAT filesystem on it.
> >
> > Can't I do the same thing by first creating a zvol and then creating
> > a FAT filesystem on it?
>
> seems not.
[...]
> Some solaris tools (like fdisk, or "mkfs -F pcfs") needs disk geometry
> to function properly. zvols doesn't provide that. If you want to use
> zvols to work with such tools, the easiest way would be using lofi, or
> exporting zvols as iscsi share and import it again.
>
> For example, if you have a 10MB zvol and use lofi, fdisk would show
> these geometry
>
> Total disk size is 34 cylinders
> Cylinder size is 602 (512 byte) blocks
>
> ... which will then be used if you run "mkfs -F pcfs -o
> nofdisk,size=20480". Without lofi, the same command would fail with
>
> Drive geometry lookup (need tracks/cylinder and/or sectors/track:
> Operation not supported
So, why can I do it with UFS?
# zfs create -V 10m rpool/vol1
# newfs /dev/zvol/rdsk/rpool/vol1
newfs: construct a new file system /dev/zvol/rdsk/rpool/vol1: (y/n)? y
Warning: 4130 sector(s) in last cylinder unallocated
/dev/zvol/rdsk/rpool/vol1: 20446 sectors in 4 cylinders of 48 tracks, 128
sectors
10.0MB in 1 cyl groups (14 c/g, 42.00MB/g, 20160 i/g)
super-block backups (for fsck -F ufs -o b=#) at:
32,
Why is this different from PCFS?
--
-Gary Mills- -Unix Group- -Computer and Network Services-
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
