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388 DS8000 Series: Concepts and Architecture
2787 2 Gigabit Fibre Channel Disk Controller PCI-X
Both can be used for multipath and there is no requirement for all paths to use the same type
of adapter. Both adapters can address up to 32 logical volumes. This does not change with
multipath support. When deciding how many I/O adapters to use, your first priority should be
to consider performance throughput of the IOA since this limit may be reached before the
maximum number of logical units. See “Sizing guidelines” on page 396 for more information
on sizing and performance guidelines.
Figure B-24 Example of multipath with iSeries
Figure B-24 shows an example where 48 logical volumes are configured in the DS8000. The
first 24 of these are assigned via a host adapter in the top left I/O drawer in the DS8000 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 left I/O drawer in the DS8000 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
right I/O drawer in the DS8000. 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 right I/O drawer.
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 376.
1. Option 3, Work with disk units.
2. Option 2, Work with disk configuration.
Volumes 25-48
IO Drawer IO Drawer
IO Drawer IO Drawer
Host Adapter 2
Host Adapter 3
IO Drawers and
Host Adapters
Volumes 1-24
Host Adapter 1
Host Adapter 4
iSeries IO
Towers/Racks
BUS a
BUS b
BUS x
BUS y
FC IOA
FC IOA
FC IOA
FC IOA
Logical connection