Less known Solaris features: Dump device estimates in Solaris 11.2
One reoccuring question from customers is „How large should i size the dump device?“. Since Solaris 11.2 there is a really comfortable way to get a number.
You can use dumpadm to get an estimate of dump device size:
Important to know, the estimate is based on the current dump configuration and the current state of the system. So you should run this comment at a moment that is representative for your usual load.
This dependency is obvious when you switch off the dumping of zfs metadata: