IBM N Series, Implementation Manual

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66 Description of Multipath S torage
Description of Multipath Storage
Multipath Storage
described The optional Multipath Storage feature for HA pairs provides two paths from
each controller to every disk shelf. Setting up Multipath Storage gateways
requires configuring an environment variable and adding cables. (See “
Setup
overview—Multipath Storage on an HA pair ” on page 69.)
The following illustration shows two nodes using Multipath Storage cabled to a
single disk shelf.
Advantages of
Multipath Storage
for HA pair The advantages of Multipath Storage are as follows:
◆
The loss of a disk shelf module, connection, or host bus adapter (HBA) does
not require a failover. The same node can continue to access the data using
the redundant path.
◆
The loss of a single disk shelf module, connection, or HBA does not prevent
a successful failover. The takeover node can access its partner’s disks using
the redundant path.
◆
You can replace modules without having to initiate a failover.
Connection types
See the Data ONTAP High Availability Configuration Guide or Data ONTAP
Active/Active Configuration Guide for details about the types of connections with
Multipath Storage.
Node A Node B
In O u t
In O u t