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Full Discussion: Solaris Mem Consumption
Operating Systems Solaris Solaris Mem Consumption Post 302223374 by reborg on Saturday 9th of August 2008 02:23:07 PM
Old 08-09-2008
There is a lot of infomation in this thread which is not valid. Almost everything Incredible has stated in this thread is incorrect in terms both of system configurations and reasons for choosing swap size.

A few points worth note.
  1. You don't need to allocate any swap space to deal with core dumps, and have not since Sorlais 8.
  2. Solaris will never go into a panic-reboot cycle as a result of not having savecore space. It will simply not save a core dump if it has no space.
  3. Twice memory as swap is no longer a good choice unless you really can't afford to upgrade.
  4. If you have a lot of pagout you do not have enough memory, it's as simple as that.
  5. You do not need minimum 16GB swap for 64 or 128GB of memory, but you may need to have more swap if you have applications using ISM (Intimate shared memory) or DISM (Dynamic Intimate Shared Memory) such as Sybase or Oracle databases.
  6. There is no reason to treat an M-Series differently from any other (SPARC) Solaris box.

In summary you can get by to some extent if you don't have enough memory by adding swap, but it will hurt performance. Ideally you should have enough memory to run all your applications in memory, and the general rule of thumb nowadays is about 30% of memory for swap but there are more detailed reccomendations in the Solaris documentation.

Jim Laurent at Sun wrote a blog on this topic about a year ago, which you could look up.

EDIT: Found the blog:Solaris FAQ: Myths and facts about Solaris swap space : Jim Laurent's Weblog
 

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