Emulation Types For Tape Devices; Libraries, Slots And Storage Capacity - HP StorageWorks D2D - Backup Systems User Manual

Port

Emulation types for tape devices

HP D2D products emulate a range of physical tape devices, these are either Tape Autoloaders or
Tape Libraries. Supported emulation types are listed below:
HP 1x8 G2 Autoloader: This is a single Ultrium tape drive autoloader with a maximum of 24
•
cartridge slots. It should be used for simple rotation schemes where a single backup job is to run
at a time. This emulation type is widely supported by backup applications.
HP MSL2024 Library: This is a tape library device with a maximum of two embedded Ultrium tape
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drives and 24 cartridge slots. It should be used when implementing rotation schemes which involve
simultaneous backup jobs to two devices. This emulation type is widely supported by backup ap-
plications.
HP MSL4048 Library: This is a tape library device with a maximum of four embedded Ultrium tape
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drives and 48 cartridge slots. It should be used when implementing rotation schemes which involve
simultaneous backup jobs to more than two devices or those that use a large number of cartridges
devices. This emulation type is widely supported by backup applications.
HP D2DBS Library: This is a tape library device with a maximum of four embedded Ultrium tape
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drives and 144 cartridge slots. If it is supported by your backup application, this is the preferred
emulation type to be used because it does not emulate any physical library types in existence and
is, therefore, clearly identifiable as a D2D device. It is the most flexible emulation type available;
however, backup application support varies by software vendor.
NOTE:
Symantec prefer their customers to use this emulation type with BackupExec and Netbackup.

Libraries, slots and storage capacity

Each slot configured commits 3 GB of physical disk space, regardless of what value has been
configured for the maximum cartridge size. This ensures that there is always sufficient space to flush
buffers and there is never data in memory that cannot be written to cartridge. The remainder of the
configured maximum capacity is used only as needed, but the initial 3 GB is permanently committed.
Therefore, only configure the number of slots that you actually require. If you configure a MSL G3
Series (2x24) with 24 cartridges, you should be aware that you have committed 72 GB of disk space
— even when no data is written. Only do this, if you are sure all slots will be used.
112 The Web Management Interface
This identifies the port to which the host is connected for backup and restore.
The number of ports available in the drop-down menu depends upon your
network configuration.
There are two LAN ports on the rear of the HP D2D. LAN port 1 must always
be connected to install the software and run the Web Management Interface.
If both ports are connected, you will be able to choose which one will be
used to transfer backup data to and from the host in the drop-down menu.
If only one port is connected, there will be only one LAN port choice (port
1).
FC products have two FC ports on the pre-installed FC card and these are
also listed in the Port drop-down menu.