NetApp AFF A200 System Documentation page 1570

g. Power cycle the shelf to make the shelf ID take effect.
You must turn off both power switches, wait 10 seconds, and then turn them back on to complete the
power cycle.
h. Repeat substeps b through g for each shelf you are hot-adding.
Cable shelves for a hot-add
How you cable an IOM12 shelf to a stack of IOM6 shelves depends on whether the
IOM12 shelf is the initial IOM12 shelf, meaning no other IOM12 shelf exists in the stack,
or whether it is an additional IOM12 shelf to an existing mixed stack, meaning one or
more IOM12 shelves already exists in the stack. It also depends on whether the stack
has multipath HA, multipath, single-path HA, or single-path connectivity.
Before you begin
• You must have met the system requirements.
Requirements for a hot-add
• You must have completed the preparation procedure, if applicable.
Prepare to manually assign drive ownership for a hot-add
• You must have installed the shelves, powered them on, and set the shelf IDs.
Install shelves for a hot-add
About this task
• You always hot-add IOM12 shelves to the logical last shelf in a stack to maintain a single speed transition
within the stack.
By hot-adding IOM12 shelves to the logical last shelf in a stack, the IOM6 shelves remain grouped together
and the IOM12 shelves remain grouped together so that there is a single speed transition between the two
groups of shelves.
For example:
◦ In an HA pair, a single speed transition within a stack having two IOM6 shelves and two IOM12 shelves
is depicted as:
Controller <-> IOM6 <-> IOM6 <---> IOM12 <-> IOM12 <-> Controller
◦ In an HA pair with onboard IOM12E storage, a single speed transition within a stack having two IOM12
shelves and two IOM6 shelves is depicted as:
IOM12E 0b <-> IOM12 <-> IOM12 <---> IOM6 <-> IOM6 <-> IOM12E 0a
The onboard storage port 0b is the port from the internal storage (expander) and because it connects
to the hot-added IOM12 shelf (the last shelf in the stack), the group of IOM12 shelves is kept together
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