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- UFS-Impaired-Storage
- ====================
- Contents
- --------
- 1. Overview
- 2. Quick reference guide
- 3. Detailed information
- 1. Overview
- -----------
- Flash storage performance can be degraded over time due to the storage and
- file system aging as well as complicated internal structure.
- Impaired Storage emulate degraded storage latencies by adding delay for each
- I/O request.
- 2. Quick reference guide
- ------------------------
- * Case1: delay all read requests by 1.5x
- echo 150 > /sys/.../impaired/read_delay_percent
- echo 1 > /sys/.../impaired/enabled
- * Case 2: delay all write requests by 300us
- echo 300 > /sys/.../impaired/write_delay_us
- echo 1 > /sys/.../impaired/enabled
- * Case 3: delay both read and write requests by 2x, then add 100us
- echo 200 > /sys/.../impaired/read_delay_percent
- echo 200 > /sys/.../impaired/write_delay_percent
- echo 100 > /sys/.../impaired/read_delay_us
- echo 100 > /sys/.../impaired/write_delay_us
- echo 1 > /sys/.../impaired/enabled
- * Case 4: emulate impaired read latencies.
- echo fragftl > /sys/.../impaired/read_model
- echo 1 > /sys/.../impaired/enabled
- 3. Detailed information
- -----------------------
- http://go/impairedstorage
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