Dump device too small to store system dump ,warning message is AIX errpt

 Hello everyone, today i am writing about following error in AIX errpt

 Dump device too small to store system dump, warning message ?????

How AIX admin resolve this error and why its important to address this error.

dump device used to store memory image or it captures memory snap when AIX system crash, so that image is very much useful during analysis by Expert or finding main cause of the system crash.

Useful command on AIX system to get information about system dump device are following:

 know the potential size of the dump AIX would generate: 

#sysdumpdev -e

To change the primary dump device as sysdumpnull: 

#sysdumpdev -p /dev/sysdumpnull

To change the secondary dump device as sysdumpnull: 

#sysdumpdev -s /dev/sysdumpnull

To change the primary device permanently:  

#sysdumpdev -P -p <device_name>

To change the secondary device permanently: 

 #sysdumpdev -P -s <device_name>

To create the secondary dump device:

Command to create dump device in AIX using mklv command, make sure that volume group have sufficient space.

 #mklv -t sysdump -y <dumplv_name> <vg_name> <no of PPs> 

 #mklv -t sysdump -y lg_dumplv rootvg 6 hdisk0

Also AIX admin can create dump device using 

smitty mklv command=>create LV=>mention LV name,type as dump and number of pps

How to calculate AIX dump device size and create required size dump device??

check following image snap ,it having details

Once aix Admin confirmed size he can create dump lv and make it primary using above command 

Thanks !!!