Quantum DXi8500, User Manual

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Chapter 2: Basic Operations
Locating the DXi8500 System Serial Number
96 Quantum DXi8500 User’s Guide
resulting in you running out of virtual media, and in turn space on the
DXi system. As a rule of thumb, more is better than less; as long as
expiry rules are defined.
Although there is no perfect size when it comes to creating virtual tape
cartridges, there are a few factors to consider. If a virtual tape cartridge
is created at 200 GB, then it will be presented as storing 200 GB of
native data.
Creating smaller sized media is preferred, for example 50 GB or 100 GB,
as it allows a virtual tape cartridge to be completely filled even when
backing up smaller data sets. Smaller sized media also aids the transfer
of data from virtual to physical tape platforms. Once again, virtual tape
cartridge size will depend on the backup application in use.
It is important to note that the design of the DXi will not allow a virtual
tape cartridge to be written to it if its size is larger than the amount of
free space available on the DXi. For example, if you have a virtual tape
cartridge size of 400 GB but only 300 GB of free space is available on the
DXi, the backup will fail when attempting to write data to the virtual
tape cartridge. As a result, smaller virtual tape cartridge sizes are better.
Remember – the DXi system is always cautious of being filled up so that
the integrity of stored data is not compromised.
Locating the DXi8500 System Serial Number
When contacting customer support or enabling a license, you might be
asked for the DXi8500 system serial number, which can be found in the
System Details
section of the DXi8500
Home
page (see Figure 55 ) or on
the back side of Base or expansion rack in the inside-bottom-left corner.