If the size of the heap data segment is limited then for large process we may have a core dump because of the way the memory management is implemented in AIX.
Following are the quick solution to try out :-
1. ulimit -d unlimited ------ should allow larger process.
2. Increase the LDR_CNTRL=MAXDATA setting at the AIX level prior to executing the command.
export LDR_CNTRL=MAXDATA=0x20000000 ( Default on AIX is 0x10000000)
To make the setting permanent, place the LDR_CNTRL=MAXDATA=0x20000000 to the end of the/etc/environment file.
All must be set in the environment of the netbackup processes at startup.
3. NBU since 6.0.MP7 takes care of such issues. Because later the way the binaries were built was changed to take into consideration such scenarios. Making the changes in the /etc/environment will make the changes for the entire system.
Technical Explaination:-
On AIX, the 32-bit address space (= 232 or 4 GB) is divided into...
Note: This is not a recommended procedure. It should be used only in extreme situations and as a last step in attempting to restore data. This procedure has been used on numerous occasions with success.
First, figure out the fragment number and the block size needed.
Ex:
# ./bpmedialist -mcontents -ev D0004
media id = D0004, allocated 09/21/99 14:19:, retention level = 1
File number 1
Backup id = jeckle_0937941543
Creation date = 09/21/99 14:19:
Expiration date = 10/05/99 14:19:
Retention level = 1
Copy number = 1
Fragment number = 1
Block size (in bytes) = 32768
Then work the tape:
ficus# tpreq -ev D0004 -a r -d dlt -p NetBackup -f /tmp/mytape
This issues a tpreq for media id D0004, the " r " is for read, the " -d " is density, " -p " is pool and " -f " is mount point.
Based on a recent study and suggestions I plan to come up with the post describing approximately how many tapes will we need to backup the data.
Ideal Data Transfer Rate = Amount of data to backup / Backup Window
Suppose you have 100 GB of data to backup and an 8 hour window then ideal data transfer rate would be 12.5 GB/hr . You would choose the Drive based on that requirement. After selecting the appropriate drive technology that provides the performance and selecting the cartridge capacity you need, we will focus on the how many cartridges you will need to have available.The number of cartridges depends upon the amount of data that you are backing up, the frequency of your backup, your retention period and the capacity of media used to store your backups.
A simple formula that can be used is
Number of Tapes= (total data to backup * Frequency of backup * Retention Period)/Tape Capacity
