Adaptec 5325301656 - Snap Server 14000 NAS, Administrator'S Manual

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Adjusting Snapshot Pool Size
98 Snap Server Administrator Guide
Adjusting Snapshot Pool Size
The current size of the snapshot pool for each RAID (or RAID group) can be viewed
by navigating to the
Storage > Snapshots
screen and clicking the
adjust snapshot
space
link in the introductory text. On the screen that opens, you can adjust the pool
up or down as necessary at any time. In addition, there are two other processes that
may affect the size of the snapshot pool:
• Creating a Volume —
In the course of creating a new volume, a pull-down menu
allows you to add a percentage of the capacity being allocated to the new volume
to the snapshot pool. This feature defaults to 20 percent, the recommended
amount of space to reserve for snapshots. If you do not plan to use snapshots
with this volume, maximize volume capacity by reducing this percentage to zero;
if you do plan to use snapshots, adjust this percentage in accordance with the
guidelines discussed in the previous section Estimating Snapshot Pool
Requirements.
• Creating a RAID Group —
When two RAIDS are grouped, their snapshot pools
are added together. For example, if RAID A with a snapshot pool of 50 GB is
grouped with RAID B with a snapshot pool of 25 GB, the resulting RAID group
will have a snapshot pool of 75 GB. Depending on the purpose you had in mind
when grouping the RAIDs, the result of combining the two snapshot pools may
or may not be desirable, and you will need to readjust the size as described
previously.
Accessing Snapshots
Snapshots are accessed via a snapshot share. Just as a share provides access to a
portion of a live volume (or file system), a snapshot share provides access to the
same portion of the file system on all current snapshots of the volume. The snapshot
share’s path into snapshots mimics the original share’s path into the live volume.
Creating a Snapshot Share
You create a snapshot share by selecting the
Create Snapshot Share
option in the
course of creating a live-volume share, under the
Advanced
button. For example,
assume you create a share to a directory called “sales,” and you select the
Create
Snapshot Share
option. When you connect to the server via Internet Explorer or
other file browser, two shares display:
SALES
SALES_SNAP
The first share provides access to the live volume, and the second share provides
access to any archived snapshots. Other than read-write settings (snapshots are