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Knowledge Base

The problem of switching the mastery and spare disk array in the condition of asynchronous replication

Publication Date:  2012-11-06  |   Views:  133  |   Downloads:  0  |   Author:  c00230043  |   Document ID:  EKB1000019088

Contents

Issue Description

There are two S5500T deploying the asynchronous replication at a certain site, the host makes two IBM midrange computers as HA, after mapping the master disk array to the host, we can find the mapped LUN, through the “lspv” we can see the disk ID and the corresponding “pvid”, map the spare disk array to the host, scan it and we find the physical volume name and the pvid are accordant with the master array via “lspv”.

Alarm Information

None

Handling Process

Delete the early information of the physical volume via the “rmdev –dl name” command, where “name” is the corresponding logical device name, such as “updisk1”;
Scan the disk via executing the command “cfgmgr –v” on the host, then execute the “lspv” to see the new “pvid” (the logical device name may not changed), and we can find the corresponding LUN mane is the right one on the disk array.

Root Cause

Because there is refreshing information while the driver program of the AIX operating system identifying the logical device, it causes there is still the early mapping relationship after changing the disk array.

Suggestions

This phenomena is related with the specific version of the AIX operating system, you can refer to the above resolution while meeting the similar problem.