Reclaiming Storage Space; Managing Virtual Device Luns - HP StorageWorks 12000 - Virtual Library System EVA Gateway User Manual

At this point, you can perform the following tasks:
• Erase cartridges — erase or relabel expired cartridges to free up storage space. See your backup
application manual for details.
NOTE:
Use the Cartridge Utilization report to identify cartridges that are consuming more space and can
be erased to create more storage space. See
Erasing data from cartridges containing data that is not deduplicated will free up more storage
space than erasing from cartridges with deduplicated data.
• Reclaim space — see
• Add more storage
NOTE:
You cannot hot-add storage while the VLS is deduplicating data.

Reclaiming Storage Space

The Reclaim Space task appears on the Chassis status screen when the storage capacity consumed
reaches the user-defined threshold (or the default of 90%). This allows you to schedule reclamation
of the additional storage you make available by erasing cartridges. First erase cartridges from your
backup application, then follow the procedure below.
From Command View VLS:
1. On the System tab, select Chassis from the navigation screen to open the Chassis status screen.
2. Select Reclaim Space in the task bar.
The VLS system initiates space reclamation and the Notifications screen displays a notification
of the scheduled reclamation.

Managing Virtual Device LUNs

The following information varies in some places from VLS firmware version 2.x and version 3.x and
is noted where this occurs.
The VLS has a LUN masking, a LUN mapping, and a port mapping feature that allows you to restrict
host access to the LUNs (virtual libraries and tape drives) configured on the VLS and assign each
virtual device to a specific Fibre Channel host port. These features allow you to allocate the virtual
devices to individual hosts and distribute the virtual tape drives across the Fibre Channel host ports
to achieve maximum bandwidth. See
VLS firmware version 3.x: You can set a global default so that either the VLS allows all hosts connected
to the VLS through the SAN to access all virtual devices configured on the VLS, or the VLS prevents
all hosts from viewing any virtual devices until they are explicitly mapped to the host. Each time you
add a new host to the VLS, it takes the global default you have set. The VLS firmware also manages
the LUN numbering so that the virtual device LUN assignments always meet operating system
requirements and restrictions. See
"Operating System LUN Requirements and
"LUN Masking
120 Configuration
"Reclaiming Storage
"Managing high
"Default LUN
(v3.x)" on page 122 and
"Receiving Automated
Space" on page 120.
availability" on page 144 for more information.
Numbering" on page 121 and
Restrictions" on page 121. See
"LUN Mapping (v3.x)" on page 123 for details of these features.
Reports" on page 166.