FAQ Unix¶

Quand dois-je utiliser un Domain ou un VirtualMountPoint ?¶

Un domaine doit TOUJOURS correspondre à un VirtualMountPoint OU à un point de montage dans un système de fichier.

Exemple:

% cat /var/spool/tsm/etc/dsm.sys
[...]
Domain /home
[...]

% cat /var/spool/tsm/etc/dsm.sys
[...]
Domain /home
VirtualMountPoint /home
[...]

ATTENTION:

Avec l'utilisation de domaines, le client TSM s'arrête aux frontières des systèmes de fichiers.
Dès lors, dans le cas ou un point de montage est présent dans une sous arborescence d'un domaine, il convient de rajouter ce point de montage en tant que domaine

Exemple:

Prenons le cas où nos options sont les suivantes:

% cat /var/spool/tsm/etc/dsm.sys
[...]
Domain /home/ccin2p3
VirtualMountPoint /home/ccin2p3
[...]

et où l'on souhaite sauvegarde tout ce qui se trouve sous /home/ccin2p3, dont l'arborescence est telle que:

/home/ccin2p3
├── file1
├── file2
└── remote_filesystem
    ├── remote_file1
    └── remote_file2

1 directory, 4 files

Si /home/ccin2p3/remote_filesystem est un point de montage, alors une sauvegarde se déroulera comme suit:

# dsmc incr
IBM Tivoli Storage Manager
Command Line Backup-Archive Client Interface
  Client Version 6, Release 2, Level 1.0  
  Client date/time: 11/26/2012 14:46:26
(c) Copyright by IBM Corporation and other(s) 1990, 2010. All Rights Reserved.

Node Name: DEMO

Session established with server CCTSM4: AIX
  Server Version 6, Release 2, Level 4.0
  Server date/time: 11/26/2012 14:46:27  Last access: 11/26/2012 14:41:11

Incremental backup of volume '/home/ccin2p3'
Directory-->               4,096 /home/ccin2p3/ [Sent]      
Normal File-->                29 /home/ccin2p3/file1 [Sent]      
Normal File-->                29 /home/ccin2p3/file2 [Sent]      
Successful incremental backup of '/home/ccin2p3'

Total number of objects inspected:        3
Total number of objects backed up:        3
Total number of objects updated:          0
Total number of objects rebound:          0
Total number of objects deleted:          0
Total number of objects expired:          0
Total number of objects failed:           0
Total number of bytes inspected:      4.05 KB
Total number of bytes transferred:     124  B
Data transfer time:                    0.00 sec
Network data transfer rate:        11,008.52 KB/sec
Aggregate data transfer rate:          0.03 KB/sec
Objects compressed by:                    0%
Total data reduction ratio:           97.02%
Elapsed processing time:           00:00:03

et tout le contenu /home/ccin2p3/remote_filesystem ne sera pas sauvegardé.

Si l'on rajoute maintenant un domaine indiquant à TSM qu'il doit prendre en compte le contenu de /home/ccin2p3/remote_filesystem:

% cat /var/spool/tsm/etc/dsm.sys
[...]
Domain /home/ccin2p3/remote_filesystem
Domain /home/ccin2p3
VirtualMountPoint /home/ccin2p3
[...]

et que nous relançons la même sauvegarde:

# dsmc incr

IBM Tivoli Storage Manager
Command Line Backup-Archive Client Interface
  Client Version 6, Release 2, Level 1.0  
  Client date/time: 11/26/2012 14:52:40
(c) Copyright by IBM Corporation and other(s) 1990, 2010. All Rights Reserved.

Node Name: DEMO

Session established with server CCTSM4: AIX
  Server Version 6, Release 2, Level 4.0
  Server date/time: 11/26/2012 14:52:41  Last access: 11/26/2012 14:52:01

Incremental backup of volume '/home/ccin2p3'

Incremental backup of volume '/home/ccin2p3/remote_filesystem'
Directory-->               1,024 /home/ccin2p3/remote_filesystem/ [Sent]      
Normal File-->                29 /home/ccin2p3/remote_filesystem/remote_file1 [Sent]      
Normal File-->                29 /home/ccin2p3/remote_filesystem/remote_file2 [Sent]      
Successful incremental backup of '/home/ccin2p3/remote_filesystem'

Directory-->               4,096 /home/ccin2p3/ [Sent]      
Normal File-->                29 /home/ccin2p3/file1 [Sent]      
Normal File-->                29 /home/ccin2p3/file2 [Sent]      
Successful incremental backup of '/home/ccin2p3'

Total number of objects inspected:        6
Total number of objects backed up:        6
Total number of objects updated:          0
Total number of objects rebound:          0
Total number of objects deleted:          0
Total number of objects expired:          0
Total number of objects failed:           0
Total number of bytes inspected:      5.11 KB
Total number of bytes transferred:     248  B
Data transfer time:                    0.00 sec
Network data transfer rate:        13,454.86 KB/sec
Aggregate data transfer rate:          0.07 KB/sec
Objects compressed by:                    0%
Total data reduction ratio:           95.27%
Elapsed processing time:           00:00:03

Dans ce dernier cas, le contenu de notre sous point de montage est bien sauvegardé.