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- Newsgroups: comp.unix.aix
- Path: sparky!uunet!gatech!darwin.sura.net!convex!constellation!geohub.gcn.uoknor.edu!dwight
- From: dwight@geohub.gcn.uoknor.edu (Dwight D. Moore)
- Subject: Re: Logical Volume Groups
- Message-ID: <1992Aug13.174635.19684@constellation.ecn.uoknor.edu>
- Sender: usenet@constellation.ecn.uoknor.edu (Nets)
- Reply-To: dwight@geohub.gcn.uoknor.edu
- Organization: Geosciences Computing Network, Univ. of Oklahoma
- References: <5684@hq.hq.af.mil> <1992Aug13.120835.2668@magnus.acs.ohio-state.edu>
- Date: Thu, 13 Aug 1992 17:46:35 GMT
- Lines: 40
-
- |>2) I feel that rootvg should not be a very large volume group as you need to
- |> make backups of it iplable using the mksysb command. Also this could
- |> impact you when you need to upgrade AIX (I just went through 3.1.5 to 3.2.2).
- |>
- |>3) If you have multiple physical volumes in a volume group, then the disk
- |> access times MAY be lowered by spreading the filesystems over several
- |> physical volumes in the volume group.
- |>
- |>4) The more disks that you have in a volume group leads to more disks having
- |> some lost data when any one of the physical volumes has to be replaced.
- |> Since you will have to restore most, and probably all, of the volume group
- |> with the bad drive in it.
-
- |>Tom Merrick
- |>Ohio State University
- |>
- I would like to second these reasons!
- It helps with the system backup (mksysb) to keep rootvg as small as possible for
- both
- backup time and restore time (in case of system failure). And lets face it, you
- should backup
- your other data separately instead of with the system files. Furthermore,we had a
- system
- failure recentely on a system with two disks, two volume groups. The system disk was
- fine
- (i.e. rootvg) and there was no need to use the sys backup tape because the corrupted
- disk
- was in its own volume group. This allows you to deal with "logical" disk groups
- without
- effecting other "groups", a nice feature to have rather than dealing with ALL the
- disks when
- one is a problem.
- ----------------------------------------------------------------------------
- Dwight D. Moore
- Geosciences Computing Network
- University of Oklahoma
-
- dwight@geohub.gcn.uoknor.edu (129.15.40.10)
- These opinions do not necessarily represent the opinions of OU or the GCN.
- ----------------------------------------------------------------------------
-