Dell PowerVault DP600 Bedienungsanleitung PDF herunterladen (Seite 95)

Time Required to Transmit Data over a Network at Various Speeds

Data size Network

speed

1 Gbps

Network

speed

100 Mbps

Network

speed

32 Mbps

Network

speed

8 Mbps

Network

speed

2 Mbps

Network

speed

512 Kbps

1 GB < 1 minute < 1 hour < 1 < 1 1.5 6

50 GB <10 minutes 1.5 hour 5 18 71 284

200 GB <36 minutes 6 hours 18 71 284 1137

500 GB <1.5 hours 15 45 178 711 2844

Note

• In the preceding table, Gbps = gigabits per second, Mbps = megabits per second, and

Kbps = kilobits per second. The figures for a network speed of 1 Gbps assume that the

disk speed on the DPM server and the protected computer are not a bottleneck.

Typically, the time to complete initial replica (IR) creation can be calculated as follows:

• IR: hours = ((data size in MB) / (.8 x network speed in MB/s)) / 3600

• Note 1: Convert network speed from bits to bytes by dividing by 8.

• Note 2: The network speed is multiplied by .8 because the maximum network efficiency is

approximately 80%.

On an extremely fast network, such as a gigabit connection, the speed of replica creation will be

determined by the disk speed of the DPM server or that of the protected computer, whichever is

slower.

The impact of replica creation on network performance can be reduced by using network

bandwidth usage throttling. For more information, see

Using Network Bandwidth Usage

Throttling.

To avoid the network load of replica creation, you can create replicas manually from tape or other

removable media. For more information, see Creating Replicas Manually

See Also

How DPM Operations Affect Performance

Managing Performance

Change Tracking

After the replica is created, the DPM protection agent on the computer begins tracking all

changes to protected data on that computer. Changes to files are passed through a filter before

being written to the volume. This process is similar to the filtering of files through antivirus

software, but the performance load of DPM tracking changes is less than the performance load of

antivirus software.

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 157 158

Kommentare zu diesen Handbüchern

Keine Kommentare

Dell PowerVault DP600 Bedienungsanleitung Seite 95

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Computerhardware Dell PowerVault DP600