Red Hat Summit17.3. Options for data protection during LUKS2 re-encryption
LUKS2 provides several options that prioritize performance or data protection during the re-encryption process.
It provides the following modes for the resilience option, and you can select any of these modes by using the cryptsetup reencrypt --resilience resilience-mode /dev/<device_ID> command, where you can replace <device_ID> with the ID of your device.
checksumThe default mode. It balances data protection and performance.
This mode stores individual checksums of the sectors in the re-encryption area, which the recovery process can detect for the sectors that were re-encrypted by LUKS2. The mode requires that the block device sector write is atomic.
journal- The safest mode but also the slowest. Since this mode journals the re-encryption area in the binary area, the LUKS2 writes the data twice.
none-
The
nonemode prioritizes performance and provides no data protection. It protects the data only against safe process termination, such as theSIGTERMsignal or the user pressing Ctrl+C key. Any unexpected system failure or application failure might result in data corruption.
If a LUKS2 re-encryption process terminates unexpectedly by force, LUKS2 can perform the recovery in one of the following ways:
- Automatically
By performing any one of the following actions triggers the automatic recovery action during the next LUKS2 device open action:
-
Executing the
cryptsetup opencommand. -
Attaching the device with the
systemd-cryptsetupcommand.
-
Executing the
- Manually
-
By using the
cryptsetup repair /dev/<device_ID>command on the LUKS2 device.
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