From: Lodge, David (David.Lodge@capitalone.com)
Date: Tue May 18 2004 - 10:48:58 EDT
It always takes a while to wrap your head around LVM, but its quite simple:
1. Physical Volumes (PV): These are either hard discs or a RAID group that
represents one device to the system - these can be seen on an 'ioscan' as
(for example) /dev/dsk/c0t5d0.
2. Volume Groups (VG): These are a collection of one or more PVs; these are
to allow a greater flexibility in management of disc space, and to aid with
clustering, for example if you had 2 databases on a system you may make one
VG for database1 and another for database2. The volume group is a directory
under /dev which contains a group file which defines the major and minor
numbers
3. Logical Volumes (LV): These are what are actually used as by the system,
these may be either raw partitions (eg for use by a database) or have a
filing system on.
4. Filing System (FS): These are placed on LVs. These are what you mount.
For mounting the new disk; check the vgscan manpage as this will read the
LVM information from the disk and will allow you to reinsert it back into
the system
HTH
dave
> -----Original Message-----
> From: Roy Kidder [mailto:RoyKidder@yahoo.com]
> Sent: 16 May 2004 23:42
> To: hpux-admin@DutchWorks.nl
> Subject: [HPADM] disk and file system help
>
>
> Admins-
>
> I'm new to HP-UX and am trying to wrap my head around the
> concepts of volume groups and logical volumes versus
> partitions as well as the different local file systems that
> HP-UX supports.
>
> Is there anywhere to get a good definition between all of these?
>
> Also -- in a practical application -- I have a single disk
> that has a single file system on it which I am adding to an
> existing machine running 11.0. The system sees the physical
> disk at 8/4.11.0. The problem is that I have no idea how to
> mount it. I have no idea what file system it's using, except
> to say that it came out of another 11.0 box.
>
> Thanks in advance,
> Roy
>
>
>
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