SG0-001 · Question #359
Which of the following would show a high amount of outstanding I/O on a host when the storage array is too busy processing data from other hosts?
The correct answer is A. High number for disk queue length field. When a storage array is overwhelmed and cannot process I/O requests promptly, a high disk queue length on the host indicates a backlog of outstanding I/O operations.
Question
Which of the following would show a high amount of outstanding I/O on a host when the storage array is too busy processing data from other hosts?
Options
- AHigh number for disk queue length field
- BLow number for MB/sec field
- CHigh number for IOPs/sec field
- DLow number for latency field
How the community answered
(15 responses)- A80% (12)
- C7% (1)
- D13% (2)
Why each option
When a storage array is overwhelmed and cannot process I/O requests promptly, a high disk queue length on the host indicates a backlog of outstanding I/O operations.
A high number for the disk queue length field indicates that the host's I/O requests are waiting to be processed by the storage subsystem. If the storage array is too busy, it cannot keep up with the incoming requests, causing these requests to queue up on the host side, thereby increasing the queue length.
A low number for MB/sec might indicate slow throughput, but it doesn't directly measure the outstanding or queued I/O requests waiting for processing due to a busy array; it's a measure of actual data transfer.
Concept tested: Storage performance metrics - disk queue
Source: https://learn.microsoft.com/en-us/windows-server/administration/performance-monitor/performance-monitor-getting-started
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