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Full Discussion: I/O bound computing clusters
Special Forums UNIX and Linux Applications High Performance Computing I/O bound computing clusters Post 302692271 by jim mcnamara on Monday 27th of August 2012 10:50:29 AM
Old 08-27-2012
If you have results, in some static form, you can dynamically mount NFS connections as needed to acces those directories.

Is your "backbone" 1GB or 10GB? If you can create a subnet for the fast NICs and each UNIX box has a 10GB NIC, this is very acceptable - what we do now. We create a job's data, notify the other box, it NFS mounts the dataset readonly, and away we go.

There is another issue to consider. Even though you may get great throughput, some boxes have issues. Solaris with older Qlogix cards takes a hit on interrupts. Because the cpu does a lot of work for the NIC.

All of this is a case of limiting factors, something you see in Science a lot. When you raise the bar on one limit (cpu) then some other resource becomes limiting (I/O in this case or interrupt stack). Since it is not economically feasible to build highways to completely handle rush hour traffic, so it is with computers. As long as it does not hurt production, and you get more processing power, you are okay. You did pay for the hadware, so use it.
 

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OCF_HEARTBEAT_FILESY(7) 					OCF resource agents					   OCF_HEARTBEAT_FILESY(7)

NAME
ocf_heartbeat_Filesystem - Manages filesystem mounts SYNOPSIS
Filesystem [start | stop | notify | monitor | validate-all | meta-data] DESCRIPTION
Resource script for Filesystem. It manages a Filesystem on a shared storage medium. The standard monitor operation of depth 0 (also known as probe) checks if the filesystem is mounted. If you want deeper tests, set OCF_CHECK_LEVEL to one of the following values: 10: read first 16 blocks of the device (raw read) This doesn't exercise the filesystem at all, but the device on which the filesystem lives. This is noop for non-block devices such as NFS, SMBFS, or bind mounts. 20: test if a status file can be written and read The status file must be writable by root. This is not always the case with an NFS mount, as NFS exports usually have the "root_squash" option set. In such a setup, you must either use read-only monitoring (depth=10), export with "no_root_squash" on your NFS server, or grant world write permissions on the directory where the status file is to be placed. SUPPORTED PARAMETERS
device The name of block device for the filesystem, or -U, -L options for mount, or NFS mount specification. (required, string, no default) directory The mount point for the filesystem. (required, string, no default) fstype The optional type of filesystem to be mounted. (required, string, no default) options Any extra options to be given as -o options to mount. For bind mounts, add "bind" here and set fstype to "none". We will do the right thing for options such as "bind,ro". (optional, string, no default) statusfile_prefix The prefix to be used for a status file for resource monitoring with depth 20. If you don't specify this parameter, all status files will be created in a separate directory. (optional, string, default .Filesystem_status/) SUPPORTED ACTIONS
This resource agent supports the following actions (operations): start Starts the resource. Suggested minimum timeout: 60. stop Stops the resource. Suggested minimum timeout: 60. notify Suggested minimum timeout: 60. monitor Performs a detailed status check. Suggested minimum timeout: 40. Suggested interval: 20. validate-all Performs a validation of the resource configuration. Suggested minimum timeout: 5. meta-data Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5. EXAMPLE
The following is an example configuration for a Filesystem resource using the crm(8) shell: primitive example_Filesystem ocf:heartbeat:Filesystem params device=string directory=string fstype=string op monitor depth="0" timeout="40" interval="20" SEE ALSO
http://www.linux-ha.org/wiki/Filesystem_(resource_agent) AUTHOR
Linux-HA contributors (see the resource agent source for information about individual authors) resource-agents 1.0.3 07/05/2010 OCF_HEARTBEAT_FILESY(7)
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