Question

I have a sharded cluster which is set up , Since my data is seamlessly growing , I need to keep monitoring the size of data and add new shards to the cluster .

Is there a command that I could use to know how much size is utilized in each sharded server , at any point of time .

For eg . lets say I have a database , and my show dbs command from mongos console shows like this

mongos> show dbs
company 0.375GB
config  0.046875GB
test    0.0625GB

I want to know how much data is used in each shard servers . for company database .

my implemented architecture is as follows

I have a single database sharded , in which each collection is sharded .
3 shard servers running mongod instances
1 server running mongos
1 server running config instance

My whole application layer is talking to mongos directly .

I need to know this because , I am planning to build a cron which checks the available size of the shard server and if it exceeds some amount it will send a notification to administrator to show some attention .

Thanks in advance for responding to this post

Answer 1

After posting in the mongoDB user group , I got the solution on how we need to do this and what commands that could be used

Commands

To know about space utilization of a particular DB in each sharded server we have to use

db.stats() 

to know about space utilization of a particular Collection in each sharded server we have to use

db.<collectionname>.stats()

Now to use it in the php daemon/cron I could call these commands using php mongo driver

$con= new Mongo()

$stats=$con->dbName->command(array('dbStats' => 1));  // for db.stats()

$stats=$con->dbName->command(array('collStats' => 'collection_name'));

Still I couldn’t find any method to execute such commands from Zend shanty mongo but I could use default PHP pecl mongo db driver to achieve this

Thank you all for responding to this post