求助！！关于SNMP监控SAS硬盘问题

fsm11

我安装了一个CACTI，结果发现监控不了SAS硬盘的状态，既SNMP取不到硬盘状态信息，报如下错误：
+ Running data query [2].
+ Found type = '3' [snmp query].
+ Found data query XML file at '../resource/snmp_queries/net-snmp_disk.xml'
+ XML file parsed ok.
+ Executing SNMP walk for list of indexes @ '.1.3.6.1.4.1.2021.9.1.1'
+ Located input field 'dskIndex' [walk]
+ Executing SNMP walk for data @ '.1.3.6.1.4.1.2021.9.1.1'
+ Found item [dskIndex='No Such Instance currently exists at this OID'] index: 1 [from value]
+ Located input field 'dskPath' [walk]
+ Executing SNMP walk for data @ '.1.3.6.1.4.1.2021.9.1.2'
+ Found item [dskPath='No Such Instance currently exists at this OID'] index: 2 [from value]
+ Located input field 'dskDevice' [walk]
+ Executing SNMP walk for data @ '.1.3.6.1.4.1.2021.9.1.3'
+ Found item [dskDevice='No Such Instance currently exists at this OID'] index: 3 [from value]
+ Found data query XML file at '../resource/snmp_queries/net-snmp_disk.xml'
+ Found data query XML file at '../resource/snmp_queries/net-snmp_disk.xml'
+ Found data query XML file at '../resource/snmp_queries/net-snmp_disk.xml'
请问那位大侠知道怎么修改！