????3.2??????
?????????????????????????????????????????????????????械??????????????????????姹�??????锟�?
????3.2.1 Dell PowerEdge R520 and R720 (used as server)
????????????OS??: Red Hat Enterprise Linux Server 6.4
?????????Architecture??: x86_64
????????Kernel??: 2.6.32
????Apache Cassandra: 2.1.2
????MongoDB: 2.6.5
????SequoiaDB: 1.8
????YCSB: 0.1.4 master (brianfrankcooper version at Github) with bankmark changes (see 4.1)
????3.2.2 HP ProLiant BL465c (used as client)
????????????OS??: SUSE Linux Enterprise Server 11
?????????Architecture??: x86_64
????????Kernel??: 3.0.13
????YCSB: 0.1.4 master (brianfrankcooper version at Github) with bankmark changes (see 4.1)
????4.???????
??????????????????YCSB???谢????????????Apache Cassandra??MongoDB ??? SequoiaDB???????????????????????????????????????????械???????????3?榇�?????3?榀�??????????????????????写???????????小?
????4.1?????????
????????????貌??????????????????????
????vm.swappiness = 0
????vm.dirty_ratio = 100
????vm.dirty_background_ratio = 40
????vm.dirty_expire_centisecs = 3000
????vm.vfs_cache_pressure = 200
????vm.min_free_kbytes = 3949963
????4.2 APACHE CASSANDRA
????Apache Cassandra?????蟹?????????????????[4]???邪??????????????????????????[5] ???小?????????????????????????写娲�??disk1 ?娲�?????????disk5??disk6 ?娲�???????
????4.3 MONGODB
????MongoDB??????????????????????????????????????????????懈????椋�?????????????泄???????????[6]???????????????????3??????????????????梅?????????????????????????mongos??????????????????????????????????????????????小?????????????????????????????????10????????????????卤??????????? ?????????

????MongoDB??????????????????????????????????10???????????????????写????YCSB??????小?
????4.4 SEQUOIADB
????SequoiaDB????????????????????????邪??[7]????????e????????????泄????????????[8]???????小?SequoiaDB???????????????????????????械????????????? “sdbcm”????????????蟹????????????????????catalog?????????????SequoiaDB???????????????????????????????
????4.5 YCSB
????YCSB??????写????些????????????????????????????YCSB??????械?????????????????????????????????泻??OPS????? ????YCSB??????????路???bankmark??????些?????????????械?YCSB 0??1??14?姹� ????????????些?????????????????锟�?
????????????????????
????Cassandra??jbellis????
????MongoDB??achille????
?????????????????SequoiaDB????
??????????MongoDB 2_12??????????????????flag??????????????????械?”???????“??????
????SequoiaDB????
???????????????????????????????些???