Vls Sizing Example 4 - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

Data types (3 Full size in GB
DB:1 FS) &
backup type
Database (Full)
50000
1% change
File Data (incre-
16666
mental 10%)*
Database (Full)
200000
1% change
File Data (incre-
66666
mental 10%)*
* Fulls on the weekend.
4. Sizing Scenario: Many-to-one (4:1) replication.
Figure 82 VLS Sizing Example 4
.
Here are four remote sites replicating 2 TB and 10 TB backups daily into a central VLS9000.
The best approach in a many-to-one scenario is:
• Size each of the individual links separately.
• Ensure the links at the target at least match the total remote size replication capacity (in this example
300 Mbits/sec).
• If possible, allow 25% extra capacity for "catch up" in the event of a backlog or paused replications
should a link go down.
186 Virtual Library Systems
Replicated Time avail-
data (com- able to replic-
pressed) in ation/time to
GB replicate
660 9.5 hours
99 3.3 hours
2640
24 hours
3960
Link speed Combined
available or link speed
required in
Mbit/sec
Assume fixed Assume fixed
dedicated link dedicated link
speed of 400 speed of 400
Mbit/sec Mbit/sec
At greater than
444 at 100%
1 Gb/sec+ at
high volumes
add extra link
666 at 100%
bandwidth for
catch-up