System Lock mode
protects file systems during replication and transfer of primary access
operations. Four important distinctions apply:
- NDMP (Network Data Management
Protocol) versus file service protocols. When
System Lock is
enabled for a file system:
- NDMP has full access (including writes) during backups, replication, and transfer of primary access.
- The file system remains in read-only mode to clients using the file service protocols (NFS, CIFS, FTP, and iSCSI).
-
System Lock versus
read only:
- When a file system is Syslocked, NDMP still has full access to that file system and can write to it.
- When a file system is mounted as read-only, NDMP (like all other protocols) has read-only access to that file system, and cannot write to it. To ensure that a file system remains completely unchanged, you should mount it as read-only.
- Replication versus transfer of primary access:
- During replication operations, the destination file system is put into System Lock mode.
- During transfer of primary access operations, both the source file system and the destination file system are put into System Lock mode.
- Read Cache Exception. A read cache may not be put into System Lock mode.