IBM XIV Gen3 Series, Planning Manual

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Ethernet (iSCSI) network configurations
Host systems can connect to an XIV system over an Ethernet network using the
Internet Small Computer System Interface (iSCSI) protocol.
Several network configurations using Ethernet are technically possible, and each
configuration varies in terms of cost, flexibility, performance, and reliability.
In the IBM XIV Storage System, each iSCSI port is defined with its own IP address.
Before you set up the iSCSI network, gather the following information for each
iSCSI port:
v IP address
v Net mask
v Default gateway
v Maximum transmission unit (MTU)
Notes:
1. If two or more iSCSI connections exist in your iSCSI network, iSCSI ports for
mirroring must be defined on switches with Flow Control Send On.
2. MTU configuration is required if the network supports an MTU that is greater
than the default 1536 bytes. Specify the largest possible MTU.
For XIV system code earlier than 11.2.0.a, the maximum MTU is 4500 bytes.
For XIV system code 11.2.0.a and later, the maximum MTU is 9000 bytes.
xiv10339
Module 9
Module 8
Module 7
Module 6
Module 5
Module 4
Hosts
Switch B
Switch A
Figure 15. Fully redundant Fibre Channel configuration with minimum cabling and paths to six
interface modules
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IBM XIV Gen3 281x-11x, 281x-21x, and 281x-314 Planning Guide