HP D2D110 HP StorageWorks D2D Backup System User Guide (EH880-90950, October 2 - Page 20

Tape rotation strategies, Storage capacity

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that you actually require. If you configure six 24-slot autoloaders, you should be aware that you have committed 192 GB of disk space. Only do this, if you are sure all slots will be used. Once added, slots cannot be removed. 8 7 6 5 8 4 7 6 3 5 4 3 2 2 1 1 1. 8 x 2 GB of physical disk space has been committed. 2. The remainder of the configured maximum capacity is used only as needed, but the initial 2 GB is permanently committed. Figure 4 Storage capacity The example configurations in "Backup scenarios using the HP D2D Backup System" on page 55 illustrate how you can make full use of the available slots in designing your backup rotation strategy and ensure that you do not create a backup scheme that would result in running out of physical disk space. NOTE: The LED indicators and the Status pages on the Web Management Interface will warn you when disks in the HP D2D Backup System exceed 90% full. Tape rotation strategies Tape rotation strategies determine when backups are run, the number of cartridges that are required and how they are reused. The HP D2D Backup System is a very flexible device that can easily be incorporated into most tape rotation strategies. If your organization does not yet have a tape rotation strategy in place, see "Backup scenarios using the HP D2D Backup System" on page 55 for example configurations. 20 Before you start

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that you actually require. If you con
fi
gure six 24-slot autoloaders, you should be aware that you have
committed 192 GB of disk space. Only do this, if you are sure all slots will be used. Once added,
slots cannot be removed.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1. 8 x 2 GB of physical disk space has been committed.
2. The remainder of the con
fi
gured maximum capacity is used only as needed, but the initial 2 GB is
permanently committed.
Figure 4 Storage capacity
The example con
fi
gurations in “
Backup scenarios using the HP D2D Backup System
” on page 55 illustrate
how you can make full use of the available slots in designing your backup rotation strategy and ensure
that you do not create a backup scheme that would result in running out of physical disk space.
NOTE:
The LED indicators and the Status pages on the Web Management Interface will warn you when disks
in the HP D2D Backup System exceed 90% full.
Tape rotation strategies
Tape rotation strategies determine when backups are run, the number of cartridges that are required and
how they are reused. The HP D2D Backup System is a very
fl
exible device that can easily be incorporated
into most tape rotation strategies. If your organization does not yet have a tape rotation strategy in place,
see “
Backup scenarios using the HP D2D Backup System
” on page 55 for example con
fi
gurations.
20
Before you start