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Chapter 3 Connections
3.1 Host Connections
ETERNUS DX60 S2 Disk storage system User’s Guide -Site Planning-
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Copyright 2012 FUJITSU LIMITED P3AM-5492-04ENZ0
Table 3.1 Ethernet frame capacity (Jumbo Frame settings)
■ SAS
Simple, cost effective, and high performance network storage environment can be configured.
Direct connections to servers are available.
The maximum transfer speed is 3Gbit/s.
3.1.2 Host Connection Path
This section explains the connection configuration between a server Host Bus Adapter (HBA)
and an ETERNUS DX Disk storage system host interface port.
■ Single path configuration
A single path configuration connects the ETERNUS DX Disk storage system to a server via a
single path.
The server cannot access an ETERNUS DX Disk storage system when a component (such as a
controller, HBA, switch, or cable) on the path has a problem. The system must be stopped during
the replacement of failed components and controller firmware.
In a single path connection configuration, the path failover and load balancing functions are not
supported.
A multipath connection configuration is recommended to maintain availability when a problem
occurs.
Jumbo Frame settings Ethernet frame capacity
Enabled Up to 9000 bytes
Disabled Up to 1500 bytes
• Confirm that the connected device supports Jumbo Frame before
enabling Jumbo Frame.
• Server-side CPU load can be reduced by using Jumbo Frame.
However, I/O performance may be reduced by 10% to 30%.
• When using a LAN switch that supports the Flow Control function,
disable the Flow Control function.
• When connecting to a server with VMware vSphere 4.0/4.1, disable
the Flow Control function of the LAN switch.
Up to two paths are allowed when the ETERNUS Multipath Driver is used.