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Special Forums UNIX and Linux Applications High Performance Computing Newbie question about using a Cluster: using memory Post 302310048 by joespr on Thursday 23rd of April 2009 02:30:51 PM
Old 04-23-2009
Question Newbie question about using a Cluster: using memory

Newbie question about clusters and memory.

Is there a way using a cluster (or any other Linux feature/technology) where I can link up a bunch of PCs such that an app thinks it has more memory than available on just one local machine?

For example, we have multiple surplus PCs with 512MB RAM (which is the max that that hw supports). Is there a way to cluster or link them up in some way such that an app would think that it has more than the 512MB RAM available, say 1GB or anything else?

I am fully aware that the speed in such a hypothetical situation would be less than ideal, but speed is not the primary concern at the moment. The primary concern is available memory.

I (think I) know how to link up machines such that disk space on several PCs could be available to an app such that the disk space for the app exceeds the available space on the local machine. But is there a way to do this with memory... using cluster or any other Linux feature or technology?

Thanks for your replies (and don't beat me up too much if this is an insane question, I'm just a newbie :-) ).
 

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commandlog(4)						     Sun Cluster File Formats						     commandlog(4)

NAME
commandlog - command log file SYNOPSIS
/var/cluster/logs/commandlog DESCRIPTION
The commandlog ASCII text file contains records of selected Sun Cluster commands that are executed in a cluster. The logging of commands starts automatically when you set up the cluster and ends when you shut down the cluster. Commands that are not logged in this file include those that display the configuration and current state of the cluster. Commands that are logged in this file include those that configure and change the current state of the cluster, as follows: o claccess o cldevice o cldevicegroup o clinterconnect o clnasdevice o clnode o clquorum o clreslogicalhostname o clresource o clresourcegroup o clresourcetype o clressharedaddress o clsnmphost o clsnmpmib o clsnmpuser o cltelemetryattribute o cluster o scconf o scdidadm o scdpm o scgdevs o scrgadm o scshutdown o scswitch Each record in the commandlog file contains the following information: o Date and timestamp o Host name from the which the command was executed o Process ID of the command o ID of the user who executed the command o Command that the user executed, including all options and operands Note - Command options are quoted in the commandlog file to enable you to copy, paste, and execute them in the shell. o Exit status or signal of the executed command By default, the commandlog file is regularly archived at the end of every week. Sun Cluster maintains up to eight previously archived com- mandlog files on each cluster node at any given time. EXAMPLES
Example 1 /var/cluster/logs/commandlog File The following example shows the contents of a typical /var/cluster/logs/commandlog file: 11/11/2006 09:43:36 phys-schost-1 5758 root START - clrg add "app-sa-1" 11/11/2006 09:43:36 phys-schost-1 5758 root END 0 11/11/2006 09:43:36 phys-schost-1 5760 root START - clrg set -y "RG_description=Department Shared Address RG" "app-sa-1" 11/11/2006 09:43:37 phys-schost-1 5760 root END 0 11/11/2006 09:44:15 phys-schost-1 5810 root START - clrg online "app-sa-1" 11/11/2006 09:44:15 phys-schost-1 5810 root END 0 11/11/2006 09:44:19 phys-schost-1 5222 root END -20988320 12/02/2006 14:37:21 phys-schost-1 5542 jbloggs START - clrg -c -g "app-sa-1" -y "RG_description=Joe Bloggs Shared Address RG" 12/02/2006 14:37:22 phys-schost-1 5542 jbloggs END 0 ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsczu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
scha_control(1HA), scha_resource_setstatus(1HA), scconf(1M), scdidadm(1M), scdpm(1M), scgdevs(1M), scrgadm(1M), scshutdown(1M), scswitch(1M), attributes(5) Sun Cluster 3.2 18 Jul 2006 commandlog(4)
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