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Re: Desktop user: Etch or the next testing?



On Thu, 2007-04-05 at 14:37 +0800, Wei Chen wrote:
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> Greg Folkert wrote:
> >       * PV == Physical Volume or some kind of media usable by LVM, these
> >         have Physical Extents on them.
> >       * VG == Volume Group which is measure in two ways, Extents and
> >         PVs. Logical Extents are the measure in which VGs use the PVs.
> >         PVs can be added or removed, therefore adding or removing
> >         Physical Extents. Logical Extents can be 1:1, or 1:X
> >       * LV == Logical Volume, this is the piece typically used with
> >         filesystems on them. Depending on *Policy* or creation
> >         restrictions, you can have a simple "gobs of disk space", using
> >         a 1:1 ratio for LE to PE. Or you can simply create a policy to
> >         have LE == 2 or more PE. The in effect mirrors the Extents on
> >         separate PVs, eliminating the problems you are talking about. 
> > 
> 
> So LVM has the power of RAID like redundancy, right?

Yes, but on a different level. You can also "migrate" data off an
existing PV if you discover it is failing, before it actually does.
Among other things.

LVM is not just about making big pools of disk into one storage area,
though it is usually that way for most people.

If you are interested, you really need to read up on LVM it is the only
way you will know the intricacies of it.
-- 
greg, greg@gregfolkert.net

Novell's Directory Services is a competitive product to Microsoft's
Active Directory in much the same way that the Saturn V is a competitive
product to those dinky little model rockets that kids light off down at
the playfield. -- Thane Walkup



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