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单选题
When setting up schedules and enforcing scheduling of different types of workloads， which of the following are critical performance issues？（）
A
Disk fragmentation
B
Performance results analysis
C
Capacity forecasting and planning
D
Resource contention and availability
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单选题Which of the following commands should be used to determine which disk of a system is experiencing a disk I/O performance problem？（）A
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istatC
vmstatD
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CPUB
MemoryC
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单选题Which of the following statements is mot correct about mirroring?（）A
Mirroring, with the write-verify option turned on, can be used to increase performance.B
Mirroring is a better choice that disk-striping, for large sequential-access file system when one is looking for performance.C
Mirroring, with a parallel-scheduling policy, may improve I/O read-operation performance.D
Mirroring, with maximum inter-disk allocation policy, is used to enhance availability.
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PowersupplyfailureB
BadHDC
BadfanD
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IBM Performance MonitorC
IBM Workload Estimator (WLE)D
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单选题When analyzing disk I/O performance， which of the following metrics and/or statistics should be included in the study？（）A
Disk size， stock availability， VHDCIB
Disk size， distance， temperature， and compatibilityC
Disk fragmentation， MTBF， and maintenanceD
Disk configuration， throughput， transactions， queues， and latencies
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