Hp Surestore Disk Array 12h and FC60 Manuel d'utilisateur télécharger pdf (Page 64)

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64 Disk Array High Availability Features

Primary and Alternate I/O Paths

There are two I/O paths to each LUN on the disk array - one through controller A and one

through controller B. Logical Volume Manager (LVM) is used to establish the primary path

and the alternate path to a LUN. The primary path becomes the path for all host I/Os to that

LUN.

If a failure occurs in the primary path, LVM automatically switches to the alternate path to

access the LUN. The first time an I/O is performed to the LUN using the alternate path, the

disk array switches ownership of the LUN to the controller on the alternate path. Once the

problem with the primary path is corrected, ownership of the LUN should be switched

back to the original I/O path to maintain proper load balancing.

The primary path established using LVM defines the owning controller for the LUN. This

may override the controller ownership defined when the LUN was bound. For example, if

controller A was identified as the owning controller when the LUN was bound, and LVM

subsequently established the primary path to the LUN through controller B, controller B

becomes the owning controller.

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Hp Surestore Disk Array 12h and FC60 Manuel d'utilisateur Page 64

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