Tandberg Data NAS Hardware Viking FS-1500 - Manual (Page 42)

Tandberg Data Shadow Copy Service
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4-4 Tandberg Viking Series Storage Server Administration Manual
When using a basic disk as a storage area for shadow copies and
converting the disk into a dynamic disk, it is important to take the following
precaution to avoid data loss:
• If the disk is a non-boot volume and is a different volume from where
the original files reside, first dismount and take offline the volume
containing the original files before converting the disk containing
shadow copies to a dynamic disk.
• The volume containing the original files must be brought back online
within 20 minutes, otherwise, the data stored in the existing shadow
copies is lost.
• If the shadow copies are located on a boot volume, the disk to can
be converted to dynamic without losing shadow copies.
Note
Use the mountvol command with the /p option to dismount the volume and take it
offline. Mount the volume and bring it online using the mountvol command or the
Disk Management snap-in.
4.2.3. Identifying the Storage Area
To store the shadow copies of another volume on the same NAS appliance,
a volume can be dedicated on separate disks. For example, if user files are
stored on H:\, another volume such as S:\ can be used to store the shadow
copies. Using a separate volume on separate disks provides better
performance and is recommended for heavily used NAS appliance.
If a separate volume will be used for the storage area (where shadow copies
are stored), the maximum size should be changed to No Limit to reflect the
space available on the storage area volume instead of the source volume
(where the user files are stored).
Disk space for shadow copies can be allocated on either the same volume
as the source files or a different volume. There is, however, a trade-off
between ease of use and maintenance versus performance and reliability
that the system administrator must consider.
For example, by keeping the shadow copy on the same volume, although
there is a potential gain in ease of setup and maintenance, there may be a
reduction in performance and reliability.
Caution
If shadow copies are stored on the same volume as the user files, note that a
burst of disk input/output (I/O) can cause all shadow copies to be deleted. If
the sudden deletion of shadow copies is unacceptable to administrators or
end users, it is best to use a separate volume on separate disks to store
shadow copies.