hi,

We have following setup:
mongos :1
config server :3
mongod (shards):10

all shards are journal enabled.

Mongod1 become non-responsive. Logs show error "too many opens files".
At same time mongos also become non-responsive. The resident memory utilization of mongod1 was 5.5GB.

Below are the logs of that time:
Wed Aug 8 15:10:15 [initandlisten] Listener: accept() returns -1 errno:24 Too many open files
Wed Aug 8 15:10:15 [initandlisten] ERROR: Out of file descriptors. Waiting one second before trying to accept more connections.
Wed Aug 8 15:10:16 [initandlisten] Listener: accept() returns -1 errno:24 Too many open files
Wed Aug 8 15:10:16 [initandlisten] ERROR: Out of file descriptors. Waiting one second before trying to accept more connections.
Wed Aug 8 15:10:17 [initandlisten] Listener: accept() returns -1 errno:24 Too many open files
Wed Aug 8 15:10:17 [initandlisten] ERROR: Out of file descriptors. Waiting one second before trying to accept more connections.
Wed Aug 8 15:10:18 [initandlisten] Listener: accept() returns -1 errno:24 Too many open files

Wed Aug 8 15:19:10 [conn11] Accessing: 00070613 for the first time
Wed Aug 8 15:19:10 [conn11] couldn't open /u01/shard1/00070613.0 errno:24 Too many open files
Wed Aug 8 15:19:10 [conn11] User Assertion: 10085:can't map file memory
Wed Aug 8 15:19:10 [conn8] Accessing: 00070613 for the first time
Wed Aug 8 15:19:10 [conn11] command admin.$cmd command:

ntoreturn:1 exception: can't map file memory code:10085 reslen:126 138744ms
Wed Aug 8 15:19:10 [conn11] Socket recv() conn closed? 192.168.11.103:33821
Wed Aug 8 15:19:10 [conn11] SocketException: remote: 192.168.11.103:33821 error: 9001 socket exception [0] server [192.168.11.103:33821]
Wed Aug 8 15:19:10 [conn8] couldn't open /u01/shard1/00070613.1 errno:24 Too many open files
Wed Aug 8 15:19:10 [conn8] User Assertion: 10085:can't map file memory
Wed Aug 8 15:19:10 [conn8] command admin.$cmd command:

ntoreturn:1 exception: can't map file memory code:10085 reslen:126 159834ms
Wed Aug 8 15:19:10 [conn8] Socket recv() conn closed? 192.168.11.103:33434

Please let us know of any solution.

Thanks,
Jitendra Verma