Re: ITP: LVM

[tom@lpsg.demon.co.uk (Tom Lees)]

On Thu, Dec 30, 1999 at 10:26:29AM +1100, Hamish Moffatt wrote:
> On Wed, Dec 29, 1999 at 05:16:46PM +0000, Tom Lees wrote:
> > Assuming that noone else has already got it (I checked the WNPP webpage
> > and it wasn't listed), I intend to package LVM, which can be found at
> > 
> > http://linux.msede.com/lvm
> 
> What is it? Could you post a short description along with your ITP?

Description: The Logical Volume Manager for Linux
 LVM includes all of the support for handling read/write operations on
 physical volumes (hard disks, RAID-Systems, magneto optical, etc.,
 multiple devices (MD), see mdadd(8) or even loop devices, see losetup(8)),
 creating volume groups from one or more physical volumes and creating
 one or more logical volumes in volume groups.

The Logical Volume Manager (LVM) adds an additional layer between
the physical peripherals and the i/o interface in the kernel to
get a logical view of disks.

This allows the concatenation of several disks (so-called physical volumes
or PVs) to form a storage pool (so-called Volume Group or VG) with
allocation units called physical extents (called PE).

Parts out of this VG then can be allocated in form of
so-called Logical Volumes or LVs in units called logical extents or LEs.
Each logical extent is mapped to a corresponding physical extent 
of equal size. These physical extents are mapped to offsets and blocks
on the disk(s).

The LVs can then be used through device special files similar to
/dev/sd[a-z]* or /dev/hd[a-z]* named /dev/VolumeGroupName/LogicalVolumeName.

But going beyond this, you are able to extend or reduce VGs AND LVs at runtime.

-- 
Tom <tom@debian.org>

When you jump for joy, beware that no-one moves the ground from beneath
your feet.
		-- Stanislaw Lem, "Unkempt Thoughts"


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