单项选择题 A customer using an IBM System Storage DS8700 is facing performance problems. After the analysis by the technical specialist， the diagnosis indicates that the cache hits may be improved by a cache upgrade.  How can the system be monitored in order to check the benefits of the cache upgrade（）

单项选择题 A booting system appears to be hanging with an LED code of 0c54. What is the likely cause?（）

单项选择题 Aclusterscriptfailedbecauseitwasunabletosetthehostname，andtheClusterManagerreportedtheeventfailure.Whatmustbedonepriortosuethe"HACMPProblemDeterminationTools"->"RecoverFromScriptFailure"tohavetheClusterManagerresumeclusterprocessing？（）