Redundant Vios Lpars With Client-Side Mpio - IBM I VIRTUALIZATION - READ ME FIRST 7-9-2010 Manual

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systems that only support active-passive connections, such as IBM's DS3000, DS4000, and

DS5000 subsystems, failover is the only method allowed.

The access method can be configured on a per-LUN basis from the VIOS command line via a

Telnet or SSH session. To show the current multi-path algorithm:

•

lsdev –dev hdiskX –attr algorithm

To change the multi-path algorithm:

•

chdev –dev hdiskX –attr algorithm=round_robin, or

•

chdev –dev hdiskX –attr algorithm=fail_over

These commands must be repeated for each hdisk.

9.3.2.2. Redundant VIOS LPARs with client-side MPIO

Beginning with IBM i 6.1 with Licensed Internal Code (LIC) 6.1.1, the IBM i Virtual SCSI (VSCSI)

client driver supports MPIO through two or more VIOS partitions to a single set of LUNs (up to a

maximum of 8 VIOS partitions). This multi-path configuration allows a VIOS partition to fail or be

brought down for service without IBM i losing access to the disk volumes since the other VIOS

partition(s) remain active. The following diagram illustrates the new capability for IBM i:

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