Check read-ahead value for Cassandra data disks
Last Updated:
June 30, 2026
- If the read-ahead values for the
Cassandra data disks were modified to enhance performance, you must verify they
remain unchanged following a Linux upgrade or migration.NOTE: Check both the Data Disks mounts and the Commit Log Disk mounts and update as required to restore optimal Cassandra performance.
- Display the current
value. Run the command:
sudo blockdev --getra /dev/<device_name>
- If the value is not as
expected, reapply the read-ahead setting. Run the comand:
sudo blockdev --setra 128 /dev/<device_name>
- Display the current
value. Run the command: