Seagate ST39103LC Podręcznik Użytkownika Pobierz pdf (Strona 12)

2 SVA Path User’s Guide

1. by allowing SVA Path to uniformly distribute primary paths

among all available I/O paths. This is the default behavior of

SVA Path.

2. by manually assigning I/O traffic for a logical drive to a

particular path. The administrator with an understanding of

the I/O load patterns of his or her applications can optimize

performance through an intelligent choice of paths.

3. by enabling automatic load balancing. In this mode of

operation SVA Path monitors the load on each path and

sends I/O requests through the path with the lightest load.

Dynamic Allocation of Device Resources

In SVA configurations with multiple servers attached to the same

storage device, SVA Path allows the system administrator to

assign a logical drive to one server and prevent the other servers in

the SVA from accessing that same logical drive.

How SVA Path Works

SVA Path’s filter driver resides between the file system drivers and

the device drivers, within the layered driver architecture. I/O

requests are passed from the file system through the drivers and

ultimately to the hardware.

SVA Path monitors the flow of I/O requests through the layered

driver architecture. When it detects a failure along an I/O path, it

automatically reroutes the request to an alternate path. Failover to

the redundant I/O path is transparent to server applications and

permits continuous access to the information stored on the disk

array(s). To the operating system, there is only a slight delay in

normal I/O operations during path failover; existing drive

numbers and device access functions continue to work as

expected.

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Seagate ST39103LC Podręcznik Użytkownika Strona 12