Chapter 14. N Series support 217
You cannot perform an NDMP file-level restore operation from SnapMirror to Tape
images. Therefore, a table of contents is never created during SnapMirror to Tape image
backups.
At the start of a SnapMirror to Tape copy operation, the file server generates a Snapshot
of the file system. NetApp provides an NDMP environment variable to control whether this
Snapshot should be removed at the end of the SnapMirror to Tape operation. Tivoli
Storage Manager always sets this variable to remove the Snapshot.
After a SnapMirror to Tape image is retrieved and copied to a NetAppfile system, the
target file system is left configured as a SnapMirror partner. NetApp provides an NDMP
environment variable to control whether this SnapMirror relationship should be broken.
Tivoli Storage Manager always breaks the SnapMirror relationship during the retrieval.
After the restore operation is complete, the target file system is in the same state as that of
the original file system at the point-in-time of backup.
14.2.1 How to set up, use, and control SnapMirror to Tape for backup
The only difference between a normal NDMP backup and a SnapMirror to Tape backup is to
specify the additional option, type=snapm, in the backup node and restore node
administrative server command. Next we describe the syntax for this option.
TYPE
This specifies the backup method used to perform the NDMP backup operation.
The default value for this parameter is BACKUPIMAGE, and it should be used to perform a
standard NDMP base or differential backup. Other image types represent backup methods
that might be specific to a particular file server.
BACKUPImage
This specifies that the file system should be backed up using an NDMP dump operation. This
is the default method for performing an NDMP backup.
The BACKUPIMAGE type operation supports full and differential backups, file-level restore
processing, and directory-level backup.
SNAPMirror
This specifies that the file system should be copied to a Tivoli Storage Manager storage pool
using the Network Appliance™ SnapMirror to Tape function.
SnapMirror images are block level full backup images of a file system.
Typically, a SnapMirror backup takes significantly less time to perform than a traditional
NDMP full file system backup. However there are limitations and restrictions on how
SnapMirror images can be used. The SnapMirror to Tape function is intended to be used as a
disaster-recovery option for copying very large Network Appliance file systems to secondary
storage.
For most Network Appliance file systems, use the standard NDMP full or differential backup
method. See the IBM Tivoli Storage Manager Administrator’s Guide for your platform for
limitations on using SnapMirror images as a backup method. The Tivoli publications can be
found at the Web site:
http://publib.boulder.ibm.com/infocenter/tsminfo/v6/index.jsp?topic=/com.ibm.itsm.
nav.doc/r_pdfs.html
218 Tivoli Storage Manager V6.1 Technical Guide
Refer to the documentation that came with your Network Appliance file server for more
information. When setting the TYPE parameter to SNAPMirror, note the following restrictions:
You cannot specify TOC=YES or TOC=PREFERRED.
The file_system_name cannot be a virtual file space name.
The snapshot that is created automatically by the file server during the SnapMirror copy
operation will be deleted at the end of the operation.
This parameter is valid for Network Appliance and IBM N-Series fileservers only.
An example of the TYPE option to start the SnapMirror to tape backup is shown in
Example 14-7.
Example 14-7 How to start a SnapMirror to tape backup
dsmadmc:
backup node SIM1 /vol/mixedvol01 type=snapm
ANR2685I SnapMirror backup of NAS node SIM1, file system /vol/mixedvol01, started
as process 16 by administrator TSMADMIN
ANR0986I Process 16 for NAS SNAPMIRROR BACKUP running in the BACKGROUND processed
1 items for a total of 6,344,704 bytes with a completion state of SUCCESS.
You will find the result of this task in several logs, queries and tables. An example of the Tivoli
Storage Manager-Server NAS-Backup query is shown in Example 14-8.
Example 14-8 query nasbackup to display the SnapMirror to tape backups
tsm: TESTPC-81>query nasbackup sim1 * type=snapm
Node Name Filespace Object Type Object Creation Mgmt Class Image
Name Size (MB) Date Name Storage
Pool Name
------------ ----------- ----------- --------- ---------- ---------- ----------
SIM1 /vol/vol0 SnapMirror 189.5 06/05/2009 STANDARD NASPOOL
18:45:00
SIM1 /vol/winvo- SnapMirror 5.5 06/03/2009 STANDARD NASPOOL
l01 19:04:53
SIM1 /vol/winvo- SnapMirror 5.5 06/03/2009 STANDARD NASPOOL
l01 20:21:36
SIM1 /vol/winvo- SnapMirror 5.5 06/03/2009 STANDARD NASPOOL
l01 20:28:26
SIM1 /vol/winvo- SnapMirror 5.5 06/03/2009 STANDARD NASPOOL
l01 20:45:13
SIM1 /vol/winvo- SnapMirror 5.5 06/03/2009 STANDARD NASPOOL
l01 20:59:28
SIM1 /vol/winvo- SnapMirror 5.5 06/03/2009 STANDARD NASPOOL
l01 21:06:49
SIM1 /vol/winvo- SnapMirror 6.1 06/04/2009 STANDARD NASPOOL
l01 19:59:45
SIM1 /vol/winvo- SnapMirror 6.1 06/04/2009 STANDARD NASPOOL
l01 20:02:31
more... (<ENTER> to continue, 'C' to cancel)
SIM1 /vol/mixed- SnapMirror 6.1 06/06/2009 STANDARD NASPOOL

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