单项选择题 A banking user with the userid of ’joe’ is unable to rsh from SYSTEMA to SYSTEMB without having to retype their password， but they can rsh from SYSTEMB to SYSTEMA. No other users are experiencing the same issue.  Both systems have a /home/joe/.rhosts file that contain the proper references to the other host. The /home/joe/.rhosts files on both SYSTEMA and SYSTEMB are owned by userid ’joe’.  Which of the following is the most likely cause of this problem（）

单项选择题 WhichofthefollowingcommandsmayindicatehardwareredundancyprotectionofaPV（）

单项选择题 Sometimes performance is more important than availability （e.g.， in cases where the data can be easily re-created）.  Which of the following is the appropriate disk configuration for an application that requires faster writes over availability（）