HP StorageWorks 1000i Virtual Library System - Manual (Page 57)

Logging off of the VLS GUI
To log off the VLS GUI, close the browser window.
NOTE:
The VLS GUI will time-out if unused for one hour.
Understanding how dynamic tape devices work
As explained previously, Dynamic Tape devices contract and expand to accommodate the size of
a specific backup job.
When your backup software starts a job, it mounts the Dynamic Tape device as if it were a physical
tape, and then begins the backup process by launching a Write operation. During this process, if the
tape position in the backup software corresponds to a logical-block address (LBA) that is less than 3, the
software treats the device as though it were overwriting a tape, and the VLS reduces the capacity of the
device to 1 GB. The appliance then releases the unused storage back into a virtual storage-pool (VSP).
When the backup software reaches an early warning (EW) state (EW is reached when less than
100 MB of space remains on the current device), the VLS reviews the following to determine whether
it can expand the size of the device:
1. It determines how much space is already consumed.
• If the current consumption exceeds 70 percent of the VSP, the appliance sends a “warning”
message to the E-mail address specified for alerts.
• If the current consumption exceeds 90 percent of the VSP, the appliance sends a “critical”
message to the E-mail address specified for alerts.
2. It determines whether you specified a maximum size for the device.
• If
a maximum size is specified (either by using the default value of 200 GB or setting a
different value), the appliance determines whether expanding the size of the tape by 1 GB
would exceed the specified capacity.
• If the expansion would not exceed the limit, the appliance increases the size of the tape by
1 GB. If the expansion is successful, an EW is not reported to the backup software. If the
expansion is unsuccessful, the EW is relayed to the backup software.
• If the expansion would exceed the limit, an EW is relayed to the backup software.
• If
you specified the full capacity of the VSP, the appliance attempts to expand the size of the
tape in 1 GB increments until the full capacity is reached. The tape full VSP tape size can
only be reached if the size is set to the full VSP.
Checking communication with other appliances or systems
The Maintenance page includes a section that lets you check network connectivity with any system,
appliance, passthrough device, or other device that has an IP address. The VLS GUI uses a ping
command to perform this check.
1. On the Support tab under Maintenance, click Ping Host. In the Ping Host IP Address pane (see Figure
46 ), type the IP address of the system that you want to check, and click Ping.
HP StorageWorks 1000i Virtual Library System 57