The dumpadm command enables system administrators to configure crash dumps of the operating system. The dumpadm configuration parameters include the dump content, dump device, and the directory to which core files are written. This command can set and change parameters as well as verify the validity of a crash dump configuration.
The savecore command is now enabled by default.
Dump data is now stored in compressed format on the dump device. Kernel crash dump images can be as big as 4 Gbytes or more. Compressing the data means faster dumping and less disk space needed for the dump device.
Saving core files is run in the background when a dedicated dump device--not the primary swap area--is part of the dump configuration. A booting system doesn't have to wait for the savecore command to complete before going to the next step. On large memory systems, the system can be available before savecore completes.
See System Administration Guide, Volume II for more information about system crash dump features.