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Which two (2) of the following criteria would be used to determine the best RAID strategy for a new server?
SCSI bus speed
Speed of the drives
Level of fault tolerance required
Cost versus performance considerations
Answer: C, D
Users are complaining that the response to database queries takes too long. Performance monitoring has identified the disk subsystem as the bottleneck. The disk subsystem is configured with these settings:
# of drives in the array 14
RAID level RAID-5 Disk stripe size 8 KB
Controller stripe size 8 KB (default) Average data transfer size 16 KB (observed) Write-cache mode Write back (default)
What change to the server's configuration would provide the best performance improvement?
Add another drive to the array
Migrate from RAID-5 to RAID-1
Change write-cache mode to Write Through
Reconfigure disk and controller stripe size to 16 KB
Based on tests performed at the IBM eServer xSeries Performance Lab, the setting for the ServeRAID controller's write-cache mode should be Write Through in a server
performing sequential reads and writes.
accessing and writing random data.
without battery-backed cache on the controller.
configured with a RAID-5 array.
Based on tests run at the IBM eServer xSeries Performance Lab, why does the Pentium
III Xeon without ATC (Tanner) scale better than the Pentium III Xeon with ATC (Cascades)?
ATC technology cannot improve performance in servers with three or more CPUs.
3-way and 4-way Tanner systems utilize the CPU more efficiently than 3-way and 4- way Cascades systems.
As more CPUs are installed in a Cascades system, memory bandwidth becomes the bottleneck.
The Cascades processor is less powerful in 3-way and 4-way configurations than the Tanner.
What is the first step in the performance tuning process?
Measure the new performance
Identify a performance bottleneck
Measure the current performance
Upgrade the component causing the bottleneck
Understand the factors affecting server performance
When running Linux, the bonnie++ benchmarking tool stresses which subsystem?
Which of the following subsystems would not typically be stressed by the pgbench benchmarking tool?
True or False: Once a server's performance has been benchmarked, only occasional monitoring of ongoing performance levels is required.
IBM 000-676 Exam (xSeries - Linux Installation/Performance Optimization) Detailed Information
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