HP B6960-96035, Руководство по концепциям

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Example 1: automated media copying of filesystem backups
Your company has a MoM environment with two cells, each containing 150 computer
systems (servers and workstations). On average, each system has 10 GB of data,
which means that you have 3000 GB of data that you want to back up.
You want to have daily Incr1 backups of the data, weekly full backups, and monthly
full backups for archiving purposes. The backups must be performed outside the
company's working hours, which means that they can start after 5 PM and must finish
before 8 AM on the next day; they can also run during weekends.
You decide to make copies of the backup media, which will remain on site for restore
purposes, and to move the originals to an off-site vault for safety reasons. The media
should be copied after the backups finish. To do this, you will use automated media
copying.
You use an HP StorageWorks 6/60 Tape Library with 6 LTO drives, and LTO Ultrium
1 media. Based on previous experience, you assume that the data transfer rate is
about 80 GB per hour, and the average capacity of a medium is 153 GB.
After the media copy operation, the source and the target media become
non-appendable. Considering this, you may want to minimize the number of media
required for the backup. It is recommended to start with empty media and use their
maximum capacity. You can achieve this by creating backup specifications with only
one device assigned. This ensures that a new medium will be used only after the
current medium is full. However, this will increase backup time compared to writing
to several media in parallel.
You decide to create 4 backup specifications. To save media space, the data is
divided between the backup specifications in such a way that the minimum number
of media possible is used. Only one device is used for each backup.
Automated media copying is performed after the backup is completed. You can use
all the available devices for the operation. This means that 3 devices will be used
for source media, and 3 devices for target media.
It is assumed that the media copying will take approximately the same amount of
time as the backup.
Incr1 backup
Configuring backups
You schedule Incr1 backups each day from Monday to Thursday at 6 PM. The data
protection is set to 4 weeks. Supposing that 30% of the data changes daily, you
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