Via config.changelog collection we can obtain information about work of balancer.
This information stores in docs with field "what" equals to "moveChunk.to"

{
"_id" : "zero-rep-02.neolabs.net-2012-06-08T07:28:41-182" ,
"server" : "zero-rep-02.neolabs.net" ,
"clientAddr" : "" ,
"time" :

{ "$date" : "2012-06-08T07:28:41.406Z"}

,
"what" : "moveChunk.to" ,
"ns" : "zero.views_raw" ,
"details" : {
"min" :

{ "sd" : 15487 , "sh" : 6 , "sr" : 0}

,
"max" :

{ "sd" : 15487 , "sh" : 6 , "sr" : 213}

,
"step1" : 52 ,
"step2" : 72 ,
"step3" : 96517 ,
"step4" : 8 ,
"step5" : 836
}
}

Please add information about

• source shard and destanation shard
• size of transferred data
• duration of operation

And can you give info what information stores in fields step1 till step5.

Thanx