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Appendix B. Using the DS6000 with iSeries 345
Figure B-24 Example of multipath with iSeries
Figure B-24 shows an example where 48 logical volumes are configured in the DS6000. The
first 24 of these are assigned via a host adapter in the top controller card in the DS6000 to a
Fibre Channel I/O adapter in the first iSeries I/O tower or rack. The next 24 logical volumes
are assigned via a host adapter in the lower controller card in the DS6000 to a Fibre Channel
I/O adapter on a different BUS in the first iSeries I/O tower or rack. This would be a valid
single path configuration.
To implement multipath, the first group of 24 logical volumes is also assigned to a Fibre
Channel I/O adapter in the second iSeries I/O tower or rack via a host adapter in the lower
controller card in the DS6000. The second group of 24 logical volumes is also assigned to a
Fibre Channel I/O adapter on a different BUS in the second iSeries I/O tower or rack via a
host adapter in the upper controller card.
Adding multipath volumes to iSeries using 5250 interface
If using the green screen 5250 interface, sign on to SST and perform the following steps as
described in “Using 5250 interface” on page 332.
1. Option 3, Work with disk units.
2. Option 2, Work with disk configuration.
3. Option 8, Add units to ASPs and balance data.
You will then be presented with a panel similar to Figure B-25 on page 346. The values in
the Resource Name column show DDxxx for single path volumes and DMPxxx for those
which have more than one path. In this example, the 1750-A85 logical volume with serial
number 75-1118707 is available through more than one path and reports in as DMP135.
4. Specify the ASP to which you wish to add the multipath volumes.
Volumes 25-48
Controllers and
Host Adapters
Volumes 1-24
iSeries IO
To w e r s / R a c k s
BUS a
BUS b
BUS x
BUS y
FC IOA
FC IOA
FC IOA
FC IOA
Logical connection