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Full Discussion: Coredumps and swap - was part of Solaris Mem Consumption
Operating Systems Solaris Coredumps and swap - was part of Solaris Mem Consumption Post 302223577 by Neo on Saturday 9th of August 2008 02:43:10 PM
Old 08-09-2008
Quote:
Originally Posted by reborg
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 savecores, 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 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
Excellent followup reborg. Thanks for taking the time to set the record straight.
 

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LEARN ABOUT SUNOS

sf880drd

sf880drd(1M)						  System Administration Commands					      sf880drd(1M)

NAME

       sf880drd - Sun Fire 880 Dynamic Reconfiguration daemon

SYNOPSIS

       sf880drd

DESCRIPTION

       The  Sun  Fire  880  Dynamic Reconfiguration daemon, sf880drd, is part of the PCI and system bus hotplug framework. sf880drd starts at boot
       time. It has no configuration options and does not report any system status.

       sf880drd implements the Sun Fire 880 console-less system administration (per-slot pushbuttons and LED status indicators). It  also  manages
       various aspects of CPU/memory hotplug.

FILES

       /usr/platform/SUNW,Sun-Fire-880/lib/sf880drd

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsfdr.u		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       svcs(1), cfgadm(1M), cfgadm_pci(1M), cfgadm_sbd(1M), svcadm(1M), attributes(5), smf(5)

NOTES

       The sf880drd service is managed by the service management facility, smf(5), under the service identifier:

       svc:/platform/sun4u/sf880drd

       Administrative  actions	on  this  service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The ser-
       vice's status can be queried using the svcs(1) command.

SunOS 5.10							    13 Aug 2004 						      sf880drd(1M)
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