[Gluster-devel] Bootstrapping glusterfsiostat

[Vipul Nayyar]

Hello,

I'm Vipul and I'll be working on a tool called glusterfsiostat under GSOC this summer with KP as my mentor. Based on our discussion, the plan for the future is to build an initial working version of the tool in python and improve it later based on feedback. This tool will display i/o information about every glusterfs mount in the system.  The primary source for getting stats would be the .meta folder accessible in every mount. As of now, the meta xlator is a good resource to get the hierarchy and basic information about every translator being used in a mount. But in terms of statistics, it only shows latency of every FOP for each xlator. 

Since, our aim is to provide information similar to the tool nfsiostat, we're hungry for more information, which is available in the private data structures maintained by io-stats. One way that I see to achieve this is to define a dumpops structure in io-stats and a priv function in it, which can be used to dump custom info into the private file in the .meta folder. If you feel that there's a better way for doing this, please do guide me.

On a second note, the tool would provide stats in properly formatted manner by default for human consumption and also in json format if it is needed by any other application.

Any feedback or suggestion would be greatly appreciated.

Regards
Vipul Nayyar 
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