Run 10 mongod shards, 1 config server,1 mongos with journal option enabled. Inserting on mongodb by mongodb c driver.System restart and try to insert data on mongodb by mongodb c driver it give error in getlasterror ok : 1 1.000000        singleShard : 2 192.168.50.113:60000        err : 2 bad offset:0 accessing file: /sata1/shard9/00030212.0 - consider repairing database        code : 16 13440        n : 16 0        connectionId : 16 1 mongod log are below Fri Feb 3 23:51:03 [conn1] insert 00030212.Database 103ms Fri Feb 3 23:51:03 [conn1] runQuery called admin.$cmd { getlasterror: 1 } Fri Feb 3 23:51:03 [conn1] run command admin.$cmd { getlasterror: 1 } Fri Feb 3 23:51:03 [conn1] command admin.$cmd command: { getlasterror: 1 } ntoreturn:1 reslen:165 0ms Fri Feb 3 23:51:03 [conn1] runQuery called admin.$cmd { getlasterror: 1 } Fri Feb 3 23:51:03 [conn1] run command admin.$cmd { getlasterror: 1 } Fri Feb 3 23:51:03 [conn1] command admin.$cmd command: { getlasterror: 1 } ntoreturn:1 reslen:165 0ms Fri Feb 3 23:51:03 [conn1] User Assertion: 13440:bad offset:0 accessing file: /sata1/shard9/00030212.0 - consider repairing database Fri Feb 3 23:51:03 [conn1] 00030212.Database caught assertion _indexRecord 00030212.Database.$_sk_1 _id: BinData Fri Feb 3 23:51:03 [conn1] insert 00030212.Database 17ms Fri Feb 3 23:51:03 [conn1] runQuery called admin.$cmd { getlasterror: 1 } Fri Feb 3 23:51:03 [conn1] run command admin.$cmd { getlasterror: 1 } Fri Feb 3 23:51:03 [conn1] command admin.$cmd command: { getlasterror: 1 } ntoreturn:1 reslen:165 0ms Fri Feb 3 23:51:03 [conn1] runQuery called admin.$cmd { getlasterror: 1 } Fri Feb 3 23:51:03 [conn1] run command admin.$cmd { getlasterror: 1 } Fri Feb 3 23:51:03 [conn1] command admin.$cmd command: { getlasterror: 1 } ntoreturn:1 reslen:165 0ms Fri Feb 3 23:51:03 [conn1] User Assertion: 13440:bad offset:0 accessing file: /sata1/shard9/00030212.0 - consider repairing database Fri Feb 3 23:51:03 [conn1] 00030212.Database caught assertion _indexRecord 00030212.Database.$_sk_1 _id: BinData please give me solution for this problem. .