This wikipage gives some details about the "Files Monitoring" software.

Objectives

The objectives of the "Files Monitoring" software are:

• Make sure that nebulous doesn't lose any OTA
• Provide statistics about the storage nodes usage

Implementation

• The software is still installed and run as schastel. TODO: Move it to ippm
• The source code is in ~schastel/dev/FilesMonitoring. In the rest of this documentation, all paths are relative to it. TODO: SVN it
• On each storage node, every hour, the NodeRelated/refresh_table.py script is started (from the crontab file defined in NodeRelated/deployment/scripts/crontab.<node name>). To prevent cluster/nfs overwhelming, the scripts are not run at the same time. The crontab files as well as the deployment script can be generated from NodeRelated/deployment/generate_crontabs_and_deployment_script.py. Run it and follow its (last) instruction to deploy. Note that error messages are currently sent to schastel@ifa.hawaii.edu.
• Every 4 hours (see schastel crontab on ippc11), the Summary/snapshot.py script is run and takes snapshots, i.e. statistics, of each storage node database.

NodeRelated/refresh_table.py Details

User Doc

• This script runs on each storage node. Each storage node should run a number of instances on this script equal to the number of its storage partitions (i.e. 1 for the mhpcc nodes, 3 for the atrc and the stsci nodes).
• The script uses the local mysql server and its DisksMonitoring database
• If the script (resp. the mysql server) are overwhelming the host (nfs, I/O, swap...), FEEL FREE TO KILL (resp. STOP) THEM. If you stop the mysql server, think of restarting it. The script should be robust enough to deal with it in the worst case, it will send an e-mail to the MAILTO recipient defined in NodeRelated/deployment/scripts/crontab.<node name>.

Script Stages

• Constants are (should be) all defined in the Constants pseudo-class
• Some initializations are performed (which disk is the script supposed to analyze, logging, ...)

Deployment

TODO:

NodeRelated/update_table.py Details

• The script depends on ipp.lifetime_templates

~schastel/local/share/python/ipp/lifetime_templates.py Details

See Cluster_Storage_Notes

Summary/refresh_table.py Details

Tools

deneb_locate.py: Locate a file using its nebulous storage key

• The "nebulous storage key" is something like gpc1/sc_test_01/stack/MD08.V2/skycell.128/MD08.V2.skycell.128.stk.418540.ppStack.mdc
• Equivalent of the neb-ls -p command but uses the different DisksMonitoring databases;
• Is installed in ~ipp/local/bin and can be executed as user ipp;
• -h to get help.

TODO Statistics