User's Manual

Chapter 9 Protect Screens
NSA-2401 User’s Guide
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" The snapshot capture fails if deleting all previous snapshots does not leave
enough space for the new snapshot. To take the snapshot, make more free
space on the disk array by recreating a volume with a smaller capacity or
upgrading the disk array to a larger storage capacity.
" It’s strongly recommended to set the maximum amount of snapshots setting
as low as possible as a high amount of snapshots can significantly reduce the
volume’s file write performance.
Purging of snapshots can also occur when more data is added to the volume. When more data
is being written it may cause the snapshot image size to increase beyond it’s original size - in
this case all the snapshots on the volume will need to expand to accommodate the extra data. If
there is not enough space for them all to expand, some snapshots may be deleted.
See Table 112 on page 260 for the maximum number of snapshots per volume.
A snapshot failure (dues to low disk space for example) generates a critical log. If you enable
the mail log feature and set the level to critical log, the NSA sends an e-mail alert.
Click Protect > Snapshot in the Navigation panel to display the following screen. Click a
column’s heading cell to sort the table entries by that column’s criteria. Click the heading cell
again to reverse the sort order.
Figure 180 Protect > Snapshot > Snapshot Jobs