If the /dev/sdb device on a Linux server experiences poor IOPS performance, which of the following could you try to improve performance?

A. Modify the default scheduler listed in /sys/block/sdb/queue/scheduler.

B. Run the echo "- - -" > /sys/class/scsi_host/host0/scan command.

C. Create a udev rule that limits unnecessary writes to /dev/sdb.

D. Recreate the block device file with a higher major number using the mknod command.

Question

High School

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Answer :

JayBlisss JayBlisss · Answer 1 · 2024-09-11T20:03:36-04:00

a. Modify the default scheduler listed in /sys/block/sdb/queue/scheduler could you try to improve performance.

Options to Improve IOPS Performance:

The I/O scheduler can significantly impact disk performance. You can change the scheduler to one that better suits your workload, such as switching from 'cfq' to 'deadline' or 'noop'. Example command: echo deadline > /sys/block/sdb/queue/scheduler.
Run the echo "- - -" > /sys/class/scsi_host/host0/scan command: This command rescans the SCSI bus and is generally used to detect new hardware, not improve performance.
Create a udev rule that limits unnecessary writes to /dev/sdb: While this could help, it is an indirect solution and more complex to implement.
Recreate the block device file with a higher major number using the mknod command: This action will not improve IOPS performance and is unrelated to performance tuning.

Therefore, the best option is to modify the default scheduler listed in /sys/block/sdb/queue/scheduler.