HP StoreOnce 4430 HP D2D Backup System Concepts guide (EH985-90915, March 2011 - Page 8

Creating and configuring virtual tape devices, Limitations on the number of devices

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as virtual. Backup application support for Ultrium VT is reasonable, but not quite as complete as the D2DBS library type, so it is not possible to use it with all backup software. NOTE: Symantec prefer their customers to use this emulation type with BackupExec and Netbackup. • 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. • MSL G3 series (2x24) Library: This is a tape library device with a maximum of two embedded Ultrium tape 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 applications. • MSL G3 series (4x48) Library: This is a tape library device with a maximum of four embedded Ultrium tape 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. • MSL G3 series (8x96) Library: This is a tape library device with a maximum of four embedded Ultrium tape drives and 96 cartridge slots. • ESL-E series Library: This is an enterprise tape solution which allows you to configure many drives per library and many cartridges per library (see values for D2DBS emulation above). Use the Show Details Box at the top of the screen to view maximum details and actual numbers used. • EML-E series Library: This is an enterprise tape library solution which allows you to configure many drives per library and many cartridges per library (see values for D2DBS emulation above). Use the Show Details Box at the top of the screen to view maximum details for drives and libraries and actual numbers used. Creating and configuring virtual tape devices Virtual tape devices may be created in two ways: • If you are creating iSCSI devices on Windows, the installation wizard will automatically create a virtual tape library for you. The default settings also create a library automatically for any host that connects using iSCSI, even if the wizard is not run. (This feature can be disabled.) • New libraries and all FC libraries are created from the Virtual Tape Devices - Devices page of the Web Management Interface, which is also used to configure devices and slots. When you configure your HP StoreOnce Backup System with a tape library, the drive emulation type that you select determines the default cartridge size for each configured slot. LTO-2 defaults to 200 GB, LTO-3 defaults to 400 GB, LTO-4 defaults to 800 GB and LTO-5 defaults to 1600 GB. This is the equivalent of a tape library with multiple slots, each containing a 200, 400, 800 or 1600 GB cartridge. Both tape spanning and, more importantly, flexible tape rotation strategies are possible. NOTE: All LTO default configurations can be configured with larger or smaller cartridge sizes. Limitations on the number of devices An important consideration when configuring VTL devices is that the library and each drive that you configure for it counts as a separate device. There are practical limitations on the number of devices that each host and FC switch or HBA can access. For iSCSI VTL devices a single Windows or Linux host can only access a maximum of 64 devices. A single library with 63 drives is the most that a single host can access. Configuring a single library 8 Virtual Tape Devices

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as virtual. Backup application support for Ultrium VT is reasonable, but not quite as complete
as the D2DBS library type, so it is not possible to use it with all backup software.
NOTE:
Symantec prefer their customers to use this emulation type with BackupExec and
Netbackup.
•
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.
•
MSL G3 series (2x24) Library:
This is a tape library device with a maximum of two embedded
Ultrium tape 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 applications.
•
MSL G3 series (4x48) Library:
This is a tape library device with a maximum of four embedded
Ultrium tape 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.
•
MSL G3 series (8x96) Library:
This is a tape library device with a maximum of four embedded
Ultrium tape drives and 96 cartridge slots.
•
ESL-E series Library:
This is an enterprise tape solution which allows you to configure many
drives per library and many cartridges per library (see values for D2DBS emulation above).
Use the
Show Details Box
at the top of the screen to view maximum details and actual numbers
used.
•
EML-E series Library:
This is an enterprise tape library solution which allows you to configure
many drives per library and many cartridges per library (see values for D2DBS emulation
above). Use the
Show Details Box
at the top of the screen to view maximum details for drives
and libraries and actual numbers used.
Creating and configuring virtual tape devices
Virtual tape devices may be created in two ways:
•
If you are creating iSCSI devices on Windows, the installation wizard will automatically create
a virtual tape library for you. The default settings also create a library automatically for any
host that connects using iSCSI, even if the wizard is not run. (This feature can be disabled.)
•
New libraries and all FC libraries are created from the
Virtual Tape Devices — Devices
page
of the Web Management Interface, which is also used to configure devices and slots.
When you configure your HP StoreOnce Backup System with a tape library, the drive emulation
type that you select determines the default cartridge size for each configured slot. LTO-2 defaults
to 200 GB, LTO-3 defaults to 400 GB, LTO-4 defaults to 800 GB and LTO-5 defaults to 1600 GB.
This is the equivalent of a tape library with multiple slots, each containing a 200, 400, 800 or
1600 GB cartridge. Both tape spanning and, more importantly, flexible tape rotation strategies
are possible.
NOTE:
All LTO default configurations can be configured with larger or smaller cartridge sizes.
Limitations on the number of devices
An important consideration when configuring VTL devices is that the library and each drive that
you configure for it counts as a separate device. There are practical limitations on the number of
devices that each host and FC switch or HBA can access.
For iSCSI VTL devices a single Windows or Linux host can only access a maximum of 64 devices.
A single library with 63 drives is the most that a single host can access. Configuring a single library
8
Virtual Tape Devices