This section provides information regarding the TSAFS support of POSIX-compliant file systems like ReiserFS, Ext2, Ext3, and XFS file systems on the Novell Open Enterprise Server (OES) 2 for Linux. These file systems are sometimes referred to in the document as non-NSS file systems.
POSIX-compliant means file systems that comply to the IEEE Std 1003.1 system interfaces. For more information, See Open Group Publications Web site.
Backup of Linux POSIX file systems requires that ACLS and POSIX permissions be set on the Linux path for the LUM-enabled user performing the backup. The root user has all permissions needed to perform backup of any Linux path. You can use the Linux chmod(8) and chown(8) commands to give the backup user the Linux POSIX permissions to the directory being backed up.
The following table lists metadata that is backed up or restored to non-NSS file systems on OES 2 Linux. The table uses the definition of metadata structure fields from the definition of the structure stat. (See man page stat(2) for more information)
|
Metadata |
Description |
|---|---|
|
st_mode |
Mode of the file, including File types and File access permissions |
|
st_nlink |
Number of hard links to the file |
|
st_uid |
User ID of the file |
|
st_gid |
Group ID of the file |
|
off_t |
Size of the file |
|
st_atime |
Time of last access |
|
st_mtime |
Time of last data modification |
File Types
Block special files
Character special files
Regular files
Directories
Symbolic links
Socket files
Additionally, TSAFS also backs up the following information for a file or directory (when applicable),
Symbolic link information
Data stream
Extended ACLs (POSIX Draft ACLs)
Extended attribute streams
File attributes on a Linux second extended file system
For more information on extended ACLs, see POSIX Access Control Lists on Linux.
For more information on file attributes on a Linux second extended file system, see man page chattr(1), installed by the RPM e2fsprogs.
Backing up and restoring Extended Attributes is supported within the same file system, but restoration is not supported across different file systems.
During restoration, a non-root user cannot overwrite the read-only files to the POSIX-complaint file systems, because write access is required for updating the files.