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【单选题】
A customer has a 16-core Power 570 with 64 GB RAM. They have 2 VIO servers and 4 LPARs， all running very heavy database applications. Storage is virtualized. The storage is SAN based and configured via MultiPath IO on the LPARs. The users are complaining about poor  performance. The VIO servers are reporting low CPU load and little memory usage. The LPARs show 100% disk busy time and are running very slowly， approximately 6-10MB/sec. The SAN reports LUN utilization of less that 20% busy time.  What should be done to resolve this problem？ （）
A.
Configure MPIO load balancing on the LPARs.
B.
Increase the SCSI queue depth per hdisk device.
C.
Increase the number of virtual SCSI devices per LPAR by 2.
D.
Increase the path priority on both virtual SCSI devices on the LPARs.
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