XIV and AIX Part Two - Zoning
anthonyv 2000004B9K Comments (2) Visits (9412)
So the next challenge when connecting your XIV to your AIX LPAR is how to zone the SAN (or hopefully, each SAN fabric).
The XIV consists of a number of modules (from 6 to 15), of which a subset are Interface Modules (meaning they have fibre channel and iSCSI interfaces)
Zone the SAN so that each HBA in an LPAR has 3 paths to the XIV.
If an LPAR has two HBAs, then zone the first HBA to modules 4, 6 and 8 and the second HBA to modules 5, 7 and 9.
For the next LPAR, do the reverse and zone the first HBA to modules 5, 7 and 9 and the second HBA to modules 4, 6 and 8.
If we look at a typical dual fabric 15 module XIV, it would be cabled as pictured below.
Port 1 on each XIV module attaches to Fabric 1
Port 3 on each XIV module attaches to Fabric 2.
Ports 2 and 4 are reserved for replication and mirroring.
But look closely at the use of colours in this lovely Visio diagram I created.
Host 1 is zoned using the links in blue.
Host 2 is zoned using the links in red.
Notice how they round robin between the odd and even numbered interface modules.
Rules of thumb
Because there is some evidence that having excessive paths can slightly raise CPU utilisation.
The other reality is that having multiple duplicate paths won't make your system more reliable.