02-01-2013
DGPickett is correct: either "tar" writes to a file (then the pipe is empty) or to <stdout>, but not both. There are some other things with your code you might want to change:
First, obviously, you shouldn't use backticks any more. Use "$(...)" instead.
Second: "gzip" is - because of the way it works - a single-threaded program. If the amount of data you compress is huge it might take a very long time. Even if your system has several processors you will always use only one. If you want to overcome this you will have to distribute the files to back up over as many "tar"s as there are processors (sort them by size and use a round-robin scheme to balance the sizes) and then gzip each tar. This way you put all system processors to use.
I hope this helps.
bakunin
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psradm(8) System Manager's Manual psradm(8)
NAME
psradm, offline, online - Stops and starts processors in a multiprocessor system
SYNOPSIS
/usr/sbin/psradm -f [-v] [[-a] [processor_id...]]
/usr/sbin/psradm -n [-v] [[-a] [processor_id...]]
/usr/sbin/online [-v] [processor_id...]
/usr/sbin/offline [-v] [processor_id...]
OPTIONS
The following options apply only to the psradm command: Specifies that all the processors except the master processor be put off line or on
line. Puts the specified processor off line. Puts the specified processor on line.
The following option applies to all forms of the command: Displays a message about the status of the operation performed on each processor.
DESCRIPTION
On a multiprocessor system, the psradm command puts one or more processors off line (stops a processor) or on line (starts a processor).
The processor_id variable specifies an integer that uniquely identifies a processor. Use the psrinfo command to display processor identi-
fication numbers.
The offline command puts one or more processors off line (stops a processor). If no processors are specified, all processors that are on
line are stopped except the master processor.
The online command puts one or more processors on line (starts a processor). If no processors are specified, all processors that are off
line are started.
Note that you cannot use these commands to start or stop the master processor in a multiprocessor system.
You must be the root user to use this command.
The /var/adm/wtmp file contains information about successful processor state transitions.
RESTRICTION
Do not use the psradm command to disable CPUs when benchmarking performance, because the command does not provide an accurate reflection of
the performance of a system that actually has fewer CPUs. Accurate performance results are obtained only when you disable the CPUs at the
SRM console command level.
EXAMPLES
The following command puts processors 2 and 3 off line: # psradm -f 2 3 The following command puts all the processors on line: # psradm -n
-a The following command puts all processors on line: # online -v
FILES
SEE ALSO
Commands: pset_info(1), psrinfo(1)
Files: processor_sets(4)
psradm(8)