How are hardware errors removed from an error report that are more than 30 days old？（）

A. /usr/bin/errpt -d H 30
B. /usr/sbin/errclear - J H 30
C. /usr/bin/errclear -d H 30
D. /usr/sbin/errclear -j H 30

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单项选择题

When a system has both online transaction processing as well as large batch processing， which of the following common procedures will best help to improve system performance？（）

A. Boost the priority of batch jobs.
B. Schedule batch runs to reduce contention with OLTP.
C. Schedule OS maintenance such that it includes frequent application of PTFs.
D. Perform incremental backups of transaction processing and full backups of batch processing.

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Data is transferred between two servers using NFS， where one server is configured with token ring， and the other system is configured with ethernet. It is discovered that the performance is greatly reduced during this transfer. Which of the following steps should be taken to improve performance？（）

A. Reduce MTU on token ring system to match ethernet system using ifconfig command （i.e. ifconfig tr0 mtu 1500）
B. Reduce MTU on token ring system to match ethernet system using no command （i.e. no -o mtu=1500）
C. Increase MTU on ethernet system to match token ring system using ifconfig command （i.e. ifconfig en0 mtu 4096）
D. Increase MTU on ethernet system to match token ring system using no command （i.e. no -o mtu=4096）

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The system administrator has determined that a new JFS log needs to be created on a different disk， in order to decrease an I/O bottleneck. Which of the following steps are the most correct？（）

A. mklv -t jfslog -y LVname VGname 1 PVname     logform /dev/LVname      chfs -a log=/dev/LVname /filesystemname m     ount and unmount filesystem
B. mklv -t jfslog -y LVname VGname PVname       unmount filesystem        vi /etc/filesystems， change entry for lv to point filesystem to new JFS log       mount filesystem
C. mklvcopy -a jfslog -y LVname VGname 1 PVname       chfs -a log=/dev/LVname /filesystemname       unmount and mount file system
D. mklvcopy -t jfslog -y LVname VGname 1 PVname       logform /dev/LVname        vi /etc/filesystems， change entry for lv to point filesystem to new JFS log      unmount and mount filesystem

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