%memused is high Post: 302992290

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Operating Systems Linux Red Hat %memused is high Post 302992290 by bakunin on Thursday 23rd of February 2017 02:11:40 PM

02-23-2017

Registered User

Quote:

Originally Posted by anil529

I checked my database config file , seems the buffers were set to min range

Hold on! If your application is a database then it is usually better to give most memory directly to the database (how this is done depends on the database used: in i.e. Oracle this is called "SGA").

The reason is that DB software makes better use of the memory than the OS is because it can load bigger parts of the DB into memory so that they can be accessed even faster than from disk.

DBs commonly use very specialised ways of accessing their files which circumvent the OSes caching completely anyways (so-called "direct I/O", "concurrent I/O", etc.) so that a reduction of system cache memory won't hurt the DB at all. If you tune a system for a DB as application - as a rule of thumb - you give so much memory directly to the DB that the system just doesn't begin to swap, regardless of how small the file cache will be this way.

I hope this helps.

bakunin

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LEARN ABOUT HPUX

cm

cm(5)								File Formats Manual							     cm(5)

NAME

       cm - cluster monitor for high availability clusters

   Remarks
       Cluster	operations require the installation of the optional Serviceguard or Serviceguard Extension for RAC software, which is not included
       in the standard HP-UX operating system.

DESCRIPTION

       Serviceguard and Serviceguard Extension for RAC are high availability products which provide an environment such that after a failure of  a
       node,  services	(applications)	can be up and running again on another node within a very short amount of time.  In addition, Serviceguard
       Extension for RAC is the enabling software for the Real Application Clusters (RAC).  Working with the basic Serviceguard product,  Service-
       guard Extension for Faster Failover allows configuration of clusters for optimized failover.

   Commands
       The following set of commands is used to configure a high availability cluster:

		     cmquerycl(1M)
		     cmmakepkg(1M)
		     cmcheckconf(1M)
		     cmapplyconf(1M)

       The following commands are used to run or halt a cluster:

		     cmruncl(1M)
		     cmhaltcl(1M)
		     cmrunnode(1M)
		     cmhaltnode(1M)
		     cmviewcl(1M)

       Once a cluster is formed, the following commands are provided for manual operation on high availability packages:

		     cmrunpkg(1M)
		     cmhaltpkg(1M)
		     cmmodpkg(1M)

       The following commands are used within a package control script to control the services and networks configured for a package:

		     cmrunserv(1M)
		     cmhaltserv(1M)
		     cmmodnet(1M)

       A command is provided to aid in migrating from a SwitchOver/UX configuration to a Serviceguard cluster:

		     cmmigrate(1M)

       This command is not applicable with Serviceguard Extension for RAC.

SEE ALSO

       Managing Serviceguard.
       Configuring RAC Clusters with Serviceguard Extension for RAC.

						      Requires Optional Serviceguard Software						     cm(5)

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