New g_part class
Poul-Henning Kamp
phk at phk.freebsd.dk
Thu Feb 8 10:33:29 UTC 2007
In message <45CAFA66.3030800 at fer.hr>, Ivan Voras writes:
>Poul-Henning Kamp wrote:
>> In message <eqdfjm$5c3$1 at sea.gmane.org>, Ivan Voras writes:
>>> span the whole disk, thus conflict with gmirror which wants to use the
>>> last sector.
>>
>> And just how does "the last sector" not occupy the same sector as
>> the last sector of the last mounted partition ?
>
>A joke? :)
>
>(in case it isn't: that's the point: it DOES, so people can't create
>mirrors of live paritions. But, like I said, I realize there's no
>elegant solution).
The correct solution is a lot of code, and all you gain is that
you save a single reboot.
Ideal Computer Science Method:
* use mount to tell filesystem to avoid last sector.
* use gctl to tell slicer to reduce parition by last sector
* implement new API so slicer can ask consumer (filesystem)
if reducing size is OK.
* use gctl to tell slicer to avoid last sector.
* use gctl to insert mirror class below slicer
* use gctl to tell mirror class to write metadata
Practically Sensible Method:
* boot single user (possibly from CD)
* use fsdb or growfs to reduce filesystem size
* reduce partition size
* use gmirror to write metadata
* reboot
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
More information about the freebsd-geom
mailing list