14.3.1 Locking between commands
The following table shows whether commands can be executed simultaneously.
Command type |
Whether commands can be executed simultaneously |
|||
---|---|---|---|---|
Updating |
Referencing |
Data manipulation |
Restoration and scale-out |
|
Updating |
N |
Y |
Y |
N |
Referencing |
Y |
Y |
Y |
Y |
Data manipulation |
Y |
Y |
Y |
Y |
Restoration and scale-out |
N |
Y |
Y |
N |
- Legend:
-
Y: Can be executed simultaneously
N: Cannot be executed simultaneously
- Notes:
-
The eztool unlock command can be executed only when a lock can be released.
The following commands can always be executed simultaneously:
-
eztool snapshot (except when the -sd or --safedump option is specified)
When an updating command is executed, a lock is obtained from the EADS server. This prevents another updating command from being executed simultaneously by another host.
Normally, a lock is released automatically when the command's processing terminates. However, if unlocking fails for some reason (such as when an error occurs and the command terminates before the lock is released), execute the eztool unlock command to unlock.