3. Select Chassis in the navigation tree.
The chassis details window opens (Figure 34).
Figure 34 Cha ssis d etails window
4. Click the Enabled box to select it.
5. Enter a percentage value in the Storage Capacity Alert box.
This percentage value is the threshold of available storage space remaining that when reached will
trigger a storage capacity notification a lert. If this threshold is set to zero (0), an alert will be sent
only when existing capacity has been reached.
6. Click Apply Settings.
To disable oversubscription, click the Enabled box to deselect it.
NOTE:
Oversubscription cannot be disabled while cartridge capacit y i s oversubscribed.
Managing virtual device LUNs
The VLS has a LUN m asking, a LUN mapping, and a p ort mapping feature that allows you to restrict host
access to the LUNs (virtual libraries and tape drives) configured on the VLS, manually assign LUN numbers
to the virtual devices by host, and assign each virtual device to a specificFChostport.Thesefeatures
allow you to allocate the virtual devices to individual hosts and distribute the vir tual tape drives a cross the
FC host ports to achieve maximum bandwidth. See Managing high availability for more information.
By default, the VLS allows all hosts connected to the VLS through the SAN to access all virtual devices
configured on the VLS. Also, the VLS software m ana ges the LUN mapping so that the virtual device LUN
assignments always meet o perating system requirements and restrictions. See Default LUN numbering and
Operating system LUN requirements and restrictions. Optionally, you can restrict host access to individual
virtual devices using the LUN masking feature then, for each LUN masked host, to use the LUN mapping
feature to manually assign LUN numbers to any virtual devices you want the host to be able to access.
See LUN masking and LUN mapping for reasons you m ay want to use these features.
Port mapping is required and allows you to assign each virtual device to one of the FC host ports or a
pair of FC host por ts (if your backup solution supports this).
68
Configuration
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