02-27-2006
If you cannot have your DBAs shutdown the database for the duration of your backup, perhaps they can put it into "hot backup mode"? This puts changes into separate files so that you can get a consistant backup of the 6 files oracle uses. You can't backup a "live" oracle database because if these 6 files aren't consistant, oracle won't touch them.
There is something about "PP size". I've yet to see this explained very well (I'm more of a Solaris guy). Essentially, you can only extend a filesystem so far. If you know you're going to expand a given filesystem, you can go in and mess with the numbers (when you build the filesystem) and make them big enough to expand things down the road (and what exactly this costs you; why you wouldn't just do this all the time, I don't have a clear understanding of either). If you just accept the defaults, then at some point, if you expand and expand and expand, you'll eventually reach a point where you can't expand anymore (something runs out of fingers and toes to count on). Whereas if you build a new filesystem from scratch, and you make it big, the defaults will bump up to some bigger numbers.
Sorry I don't have a better explaination; I don't understand it well myself. Perhaps someone who does understand all this can explain it better. I'm just thinking that perhaps this is what IBM is talking about.
Of course, you can call IBM back and ask them to explain it to you...
PS: It is my understand that a JFS2 filesystem doesn't have all this. I don't know when they added JFS2 or if that is an option for you.
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LEARN ABOUT DEBIAN
gfs_grow
gfs_grow(8) System Manager's Manual gfs_grow(8)
NAME
gfs_grow - Expand a GFS filesystem
SYNOPSIS
gfs_grow [OPTION]... <DEVICE|MOINTPOINT>...
DESCRIPTION
gfs_grow is used to expand a GFS filesystem after the device upon which the filesystem resides has also been expanded. By running gfs_grow
on a GFS filesystem, you are requesting that any spare space between the current end of the filesystem and the end of the device is filled
with a newly initialized GFS filesystem extension. When this operation is complete, the resource index for the filesystem is updated so
that all nodes in the cluster can use the extra storage space which has been added.
You may only run gfs_grow on a mounted filesystem; expansion of unmounted filesystems is not supported. You only need to run gfs_grow on
one node in the cluster. All the other nodes will see the expansion has occurred and automatically start to use the newly available space.
You must be superuser to execute gfs_grow. The gfs_grow tool tries to prevent you from corrupting your filesystem by checking as many of
the likely problems as it can. When expanding a filesystem, only the last step of updating the resource index affects the currently
mounted filesystem and so failure part way through the expansion process should leave your filesystem in its original unexpanded state.
You can run gfs_grow with the -Tv flags to get a display of the current state of a mounted GFS filesystem. This can be useful to do after
the expansion process to see if the changes have been successful.
gfs_grow will consume all the remaining space in a device and add it to the filesystem. If you want to add journals too, you need to add
the journals first using gfs_jadd.
OPTIONS
-h Prints out a short usage message and exits.
-q Quiet. Turns down the verbosity level.
-T Test. Do all calculations, but do not write any data to the disk and do not expand the filesystem. This is used to discover what the
tool would have done were it run without this flag. You probably want to turn the verbosity level up in order to gain most informa-
tion from this option.
-V Version. Print out version information, then exit.
-v Verbose. Turn up verbosity of messages.
SEE ALSO
mkfs.gfs(8) gfs_jadd(8)
gfs_grow(8)