On Mon, 24 Apr 2006, Frank-Michael Fischer wrote:
Stephen Liu wrote:
I did not use LVM logical volume before. What will be its advantage?
TIA
B.R.
SL
Advantage: you may add more disk space later on without disrupting your
directory structure. BIG disadvantage: if one physical disk (or even
You can also resize partitions relatively easily inside an LVM.
just physical partition) in an LVM fails your whole file system is gone.
No repair possible. And another BIG disadvantage on dual systems with
Windows: Unlike "traditional" ext3 partitions you may access read/write
from Windows you will not be able to access anything on an LVM.
Both good points (the first only if you spread your VolGroups over
multiple drives, the second only if you really care to access ext3
partitions from Windows and aren't interested in virtualization).
Practical conclusion: except on systems keeping non-unique temporary
data (example for such data: scans of existing documents for further
processing and later archival) stay away from LVM.
Or have backups. (Not a bad idea anyway.)
We should not forget we are paying Redhat a price for getting "free"
Fedora: we are Guinea pigs for in most situations pretty useless staff
like selinux and lvm. Thats why these are installation defaults. I do
not know e.g. about a single company reducing its profits or increasing
its losses by not having selinux.
How big is your sample?
Military and similar people in their
special way of thinking just love selinux and even LVM. LVM gives you
the possibility to somehow use scattered parts (disks from otherwise
broken PCs) and turn them into one single large disk for a running
Ah, another advantage for LVM--no need to repartition an existing disk
with scattered empty space and no need to limit filesystem sizes to
individual partition sizes.
system (until the next bomb explodes). Therefore: anyone who likes to
support all the military woldwide as potential Redhat customers should
spent hours and hours testing selinux for Fedora. ;-)
FMF
--
Matthew Saltzman
Clemson University Math Sciences
mjs AT clemson DOT edu
http://www.math.clemson.edu/~mjs
