That is, any I/O to multipatha can use either path. If multipathing is enabled, there will be a multipath disk, for example /dev/multipatha, that can access both paths. The system may access sdb or sdc, the access ends up in the same place. They will appear as /dev/sdb and /dev/sdc. The Linux SCSI driver will see both paths. The machine has two connections, or paths, to that external storage. Here's an example: say a system has one local disk, /dev/sda, and one disk attached via external storage. A single disk can appear three times in a multipath configuration: ASM cannot handle seeing the same disk twice. There are two issues with using multipath disks in ASM. This document gives multipath disks the name " multipatha", so as to be storage vendor agnostic. It assumes that the multipath disks are already configured with whatever tools are provided by the storage. This document describes the steps required to configure the Linux specific ASM library provided by Oracle (herin "ASMLib") to access multipath disks. Configuring Oracle ASMLib on Multipath Disks
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