1)the os for mongod:
linux  2.6.32-504.el6.x86_64

2) db version:
PRIMARY> db.version()
2.6.5

3)the output for rs.status():
rs.status()
{
        "set" : "UCMSINVEST",
        "date" : ISODate("2015-07-27T05:53:50Z"),
        "myState" : 2,
        "syncingTo" : "10.33.29.37:24000",
        "members" : [
                {
                        "_id" : 0,
                        "name" : "10.33.29.36:24000",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "uptime" : 582864,
                        "optime" : Timestamp(1437976430, 2453),
                        "optimeDate" : ISODate("2015-07-27T05:53:50Z"),
                        "self" : true
                },
                {
                        "_id" : 1,
                        "name" : "10.33.29.37:24000",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "uptime" : 582859,
                        "optime" : Timestamp(1437976429, 834),
                        "optimeDate" : ISODate("2015-07-27T05:53:49Z"),
                        "lastHeartbeat" : ISODate("2015-07-27T05:53:49Z"),
                        "lastHeartbeatRecv" : ISODate("2015-07-27T05:53:50Z"),
                        "pingMs" : 0,
                        "electionTime" : Timestamp(1435572793, 1),
                        "electionDate" : ISODate("2015-06-29T10:13:13Z")
                },
                {
                        "_id" : 2,
                        "name" : "10.33.28.180:24001",
                        "health" : 1,
                        "state" : 7,
                        "stateStr" : "ARBITER",
                        "uptime" : 582859,
                        "lastHeartbeat" : ISODate("2015-07-27T05:53:49Z"),
                        "lastHeartbeatRecv" : ISODate("2015-07-27T05:53:49Z"),
                        "pingMs" : 0
                }
        ],
        "ok" : 1
}

4)the last startup_log info(primary):
{ "_id" : "cnsz081233-1435572786738", "hostname" : "cnsz081233", "startTime" : ISODate("2015-06-29T10:13:06Z"), "startTimeLocal" : "Mon Jun 29 18:13:06.738", "cmdLine" : { "config" : "/paic/mongodb/mg24000/etc/mg.cnf", "net" : { "bindIp" : "10.33.29.37", "http" : { "enabled" : false }, "port" : 24000 }, "operationProfiling" : { "mode" : "slowOp", "slowOpThresholdMs" : 100 }, "processManagement" : { "fork" : true, "pidFilePath" : "/paic/mongodb/mg24000/etc/mg.pid" }, "replication" : { "oplogSizeMB" : 200000, "replSetName" : "UCMSINVEST" }, "security" : { "clusterAuthMode" : "keyFile", "keyFile" : "/paic/mongodb/mg24000/etc/mg.key" }, "storage" : { "dbPath" : "/paic/mg24000/data", "directoryPerDB" : true, "journal" : { "commitIntervalMs" : 100, "enabled" : true }, "nsSize" : 16, "syncPeriodSecs" : 60 }, "systemLog" : { "destination" : "file", "logAppend" : true, "path" : "/paic/mongodb/mg24000/log/mg.log", "quiet" : true, "verbosity" : 5 } }, "pid" : NumberLong(10139), "buildinfo" : { "version" : "2.6.5", "gitVersion" : "e99d4fcb4279c0279796f237aa92fe3b64560bf6", "OpenSSLVersion" : "", "sysInfo" : "Linux build8.nj1.10gen.cc 2.6.32-431.3.1.el6.x86_64 #1 SMP Fri Jan 3 21:39:27 UTC 2014 x86_64 BOOST_LIB_VERSION=1_49", "loaderFlags" : "-fPIC -pthread -Wl,-z,now -rdynamic", "compilerFlags" : "-Wnon-virtual-dtor -Woverloaded-virtual -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -pipe -Werror -O3 -Wno-unused-function -Wno-deprecated-declarations -fno-builtin-memcmp", "allocator" : "tcmalloc", "versionArray" : [ 2, 6, 5, 0 ], "javascriptEngine" : "V8", "bits" : 64, "debug" : false, "maxBsonObjectSize" : 16777216 } }

5) the startup_log info(secondary):
{ "_id" : "cnsz081232-1435572839610", "hostname" : "cnsz081232", "startTime" : ISODate("2015-06-29T10:13:59Z"), "startTimeLocal" : "Mon Jun 29 18:13:59.610", "cmdLine" : { "config" : "/paic/mongodb/mg24000/etc/mg.cnf", "net" : { "bindIp" : "10.33.29.36", "port" : 24000 }, "processManagement" : { "fork" : true }, "replication" : { "replSet" : "UCMSINVEST" }, "security" : { "keyFile" : "/paic/mongodb/mg24000/etc/mg.key" }, "storage" : { "dbPath" : "/paic/mg24000/data", "journal" : { "enabled" : true } }, "systemLog" : { "destination" : "file", "logAppend" : true, "path" : "/paic/mongodb/mg24000/log/mg.log" } }, "pid" : NumberLong(25290), "buildinfo" : { "version" : "2.6.5", "gitVersion" : "e99d4fcb4279c0279796f237aa92fe3b64560bf6", "OpenSSLVersion" : "", "sysInfo" : "Linux build8.nj1.10gen.cc 2.6.32-431.3.1.el6.x86_64 #1 SMP Fri Jan 3 21:39:27 UTC 2014 x86_64 BOOST_LIB_VERSION=1_49", "loaderFlags" : "-fPIC -pthread -Wl,-z,now -rdynamic", "compilerFlags" : "-Wnon-virtual-dtor -Woverloaded-virtual -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -pipe -Werror -O3 -Wno-unused-function -Wno-deprecated-declarations -fno-builtin-memcmp", "allocator" : "tcmalloc", "versionArray" : [ 2, 6, 5, 0 ], "javascriptEngine" : "V8", "bits" : 64, "debug" : false, "maxBsonObjectSize" : 16777216 } }

6) the output for rs.conf():
> rs.conf()
{
        "_id" : "UCMSINVEST",
        "version" : 3,
        "members" : [
                {
                        "_id" : 0,
                        "host" : "10.33.29.36:24000"
                },
                {
                        "_id" : 1,
                        "host" : "10.33.29.37:24000"
                },
                {
                        "_id" : 2,
                        "host" : "10.33.28.180:24001",
                        "arbiterOnly" : true
                }
        ]
}

7) java driver version:
mongo-java-driver-2.12.2.jar