can't sharding on MongoDB

[bth...@gmail.com]

I have a cluster with 2 prelica set

replica set r1: db1, db2 same in 3 servers
replica set r2: db3, db4 same in 2 servers
i sharding on db1 with 2 chunk, 1 chunk on r1 and the other on r2, all writes and read is good by using mongos
and then i connect to mongos and i want to change chunks on db1, i deleted all chunks on db1 in config,chunks
and then i can't run command db.runCommand({enablesharding:"db1"}) => error "already enabled"
and i can't run another command db.runCommand({shardCollection:"db1.test1",key:{a:1}}) => error "already sharded"

And when i finish sharding, how can i change range of chunks in my cluster, spit or merge???
Can you give me some advice!!
Thanks
Phuc

[Max Schireson]

Take a look here http://www.mongodb.org/display/DOCS/Splitting+Shard+Chunks for info on setting up your own split points. Other doc explains the balancer and when it migrates chunks for example.

-- Max

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[Max Schireson]

I should add that the intention is that these operations be managed automatically under most circumstances other than initial bulk loads. Please see http://www.mongodb.org/display/DOCS/Sharding+Administration to learn about that.

-- Max