lofi(7D) compression support PSARC/2007/569 FastTrack [restart]

[Alok Aggarwal]

On Mon, 8 Oct 2007, Darren J Moffat wrote:

> I feel strongly that -C and -a are mutually exclusive options, as are -U and 
> -d.
>
> -a maps a file as a device node - lofi's main job, it does not modify the 
> file in any way (an upper layer filesystem or application may).
>
> -C/-U actually transforms a file in a destructive manner by doing a 
> copy/modify/rename.

This is a good point.

> The compress could take a long time and take a non trivial amount of 
> cpu/memory and diskspace.  So much that a progress indication would be good, 
> however such a progress indication would be incompatible with the current 
> output of -a since it is explicitly listed as being scriptable.

I'll make the change to where -a won't be allowed with -C.
That is, the command line specification would be -

/usr/sbin/lofiadm -C [algorithm] [-s segment_size] file

The following won't be allowed -

/usr/sbin/lofiadm -a [-C [algorithm] [-s segment_size]] file

The case materials will be updated shortly to reflect this
change.

Alok