Hp Hitachi Dynamic Link Manager Software Manuel d'utilisateur télécharger pdf (Page 38)

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2. HDLM Functions

2.7 Distributing a Load Using Load Balancing

When the system contains multiple paths to a single LU, HDLM can distribute the load

across the paths by using multiple paths to transfer the I/O data. This function is called

load balancing, and it prevents a single, heavily loaded path from affecting the

performance of the entire system.

Note that some I/O operations managed by HDLM can be distributed to each path,

while others cannot. Therefore, even though load balancing function is used, I/O

operations might not be equally allocated to each path.

Figure 2-5: Flow of I/O Data When the Load Balancing Function Is Not Used shows

the flow of I/O data when the load balancing function is not used. Figure 2-6: Flow

of I/O Data When the Load Balancing Function Is Used shows the flow of I/O data

when the load balancing function is used. Both figures show an example of an I/O

being issued for the same LU from multiple applications.

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Hp Hitachi Dynamic Link Manager Software Manuel d'utilisateur Page 38

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