volume management

[Gergely CZUCZY]

On Mon, Apr 09, 2007 at 09:28:35AM -0500, Eric Anderson wrote:
> On 04/08/07 13:57, Dag-Erling Smørgrav wrote:
> >Gergely CZUCZY <phoemix at harmless.hu> writes:
> >>yeap, i know about ZFS, as i assume, it will need around 1.5-2 years
> >>from now, when 7.0-RELEASE will be ready.
> >No, it's expected this fall.
> >>and i'm looking for a solution for a production environment within
> >>a year.
> >There is no other solution.
> 
> How about gconcat?  You could create a mirror, then gconcat another mirror, etc, extending the GEOM. 
>  Then run growfs on that extended volume.  Wouldn't that work?
why gmirror? gconcat somehow could be used for this,
but
1) i see no attach operation for gconcat to add
providers on the fly.
2) this would require to always create subpartitions/bsdlabels
on the disk, and add a bit more on need.

like the following example:
 - there are 4 filesystems by default: fs1,fs2,fs3,fs4
 - given da0s1g the "reminder" of the disks, that will give
 the space needed for the services. we allocate  4 labels for
 the services: da0s1ga, da0s2gd, da0s2ge, da0s2gf
 - we concat the four bsdlabels, to be able to later on enlarge them.

now increasing the size would look like ( _IF_ gconcat would support it):
 - creating a new bsdlabel, that would serve as the incrementum, like
 we add da0s2gg
 NOTE: we reach "h" we cannot add more, bsdlables are limited. we would
 have to recursively bsdlabel all the last bsdlabels to have te ability
 to chop another piece that could be added later on.
 - attaching the new partition to the already existing concat
 - growing the filesystem

all of this looks like a PITA to me. like we would need
a spoon, and all we have is a hammer, so we start eating our
soup with the hammer...

i have the definite feeling that gconcat serves a whole different
propose.

Bye,

Gergely Czuczy
mailto: gergely.czuczy at harmless.hu

-- 
Weenies test. Geniuses solve problems that arise.
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