XIV Issues & Fixes

No	Description	Status	Full Doc
XIV001	AIX HAK Default Settings Issue:- By default, the Host Attachment Kits for AIX default to “failover”. Setting this to “Round Robin” for performance limits Queue Depth to “1”. This further limits XIV performance.	Resolved – AIX 6.1 and above can be set to Round Robin and variable Queue Depth – greater then “20” is advised. Workaround defined by users for pre-6.1 AIX versions (see link)
XIV002	AIX Hosts will not directly attach to XIV array:- When attaching AIX, P-series Host to XIV, a common issue is the failure of WWNs to show up on the XIV GUI – without this, no host-storage connection is possible.	Resolved – IBM have removed all support for direct-attached hosts, best practice is now SAN-attached in all instances. (Not much of a resolution, but now you know).
XIV003	Loss of 2 x XIV FC Interface Ports:- As the 4 ports per interface module are implemented using 2 x Dual-port HBAs in the rear of each module, failure of an HBA will cause 2 of the 4 ports to fail – this will be grouped as either ports 1&2, or 3&4.	Resolved – IBM best practice now recommends using ports 1&3 for host attachment, and 2&4 for replication. This limits the possibility of failure where only two host ports are used per module.

The Storage Gorilla