Under the condition of synchronous replication, the peak write bandwidth of an application is 16 MB / s, the average write bandwidth is 500 KB / s, and the average write IO is 8 KB. If the bandwidth utilization rate is 80%, then the disaster recovery end network bandwidth should not be less than:

Question

Under the condition of synchronous replication, the peak write bandwidth of an application is 16 MB / s, the average write bandwidth is 500 KB / s, and the average write IO is 8 KB.  If the bandwidth utilization rate is 80%, then the disaster recovery end network bandwidth should not be less than:

Quizplus · Accepted Answer

The peak write bandwidth is 16 MB / s, and the bandwidth utilization rate is 80%, so the required network bandwidth is 16 MB / s * 80% = 12.8 MB / s. Since the average write IO is 8 KB, the average write bandwidth is 500 KB / s, so the number of write IO per second is 500 KB / s / 8 KB = 62.5 IO / s. Therefore, the required network bandwidth is 12.8 MB / s / 62.5 IO / s = 204.8 kb / s. Since the network bandwidth is usually expressed in Mb / s, the required network bandwidth is 204.8 kb / s / 1024 = 0.2 Mb / s. Therefore, the disaster recovery end network bandwidth should not be less than 0.2 Mb / s, which is closest to 22.5 Mb / s.

Under the Condition of Synchronous Replication, the Peak Write Bandwidth