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The Data Protector Catalog Database is approximately 0.4 GB in size. It is
backed up locally to an HP StorageWorks DAT24 autoloader, which has a
sustained data transfer rate of 2 MB/s or 7 GB/h. Data Protector by default
checks the integrity of the database before the database is backed up. It takes
less than half an hour to check the integrity of a 0.4 GB database and only
a few minutes to back up the database. Therefore, to check the integrity of,
and then back up the IDB and configuration files requires less than 1 hour.
The projected size of the database in five years time is 1.2 GB. It takes less
than an hour to check the integrity of a 1.2 GB database and less than half
an hour to back it up. Therefore, to check the integrity of, and then back up
the IDB and configuration files requires less than 2 hours.
All the other available data in the system, which is currently about 55 GB) is
backed up remotely to the HP StorageWorks DLT 4115w Library, which has
a sustained data transfer rate of 3 MB/s, or 10.5 GB/h. Most of this data is
via the 100TX network, which has a sustained data transfer rate of 10 MB/s,
or 36 GB/h, of data. This does not present a bottleneck. The backup of all
these data would therefore take about 5 to 7 hours to complete. This is well
within the allowed 12 hours. The problem would then be that in five years
time, when the data is projected to be about 170 GB, the backup would take
15 to 21 hours!
To solve this problem, use the staggering approach. Schedule the full backup
of data in the English Department for Fridays at 20:00, and that in the Other
Languages Department for Saturdays at 20:00 and that in the Admin
Department for Sundays at 20:00.
Table 17 The staggering approach
SunSatFriThuWedTueMon
Incr1FullIncr1Incr1Incr1Incr1English
FullIncr1Incr1Incr1Incr1Incr1Other
Languages
FullIncr1Incr1Incr1Incr1Incr1Admin
Backup scenarios308