Dell PowerVault MD3000 Manuale di sintonizzazione - Pagina 23

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Dell™ PowerVault MD3000 and MD3000i Array Tuning Best Practices

5 Considering the Host Server(s)

Available bandwidth depends on the server hardware. The number of buses adds

to the aggregate bandwidth, but the number of HBAs sharing a single bus can

throttle the bandwidth. Additionally, some server hardware has slower-speed PCI-

E ports (4x) as well as high-speed ports (8x). The Dell SAS5e HBAs are PCI-E 8x

devices and should be installed in 8x slots for maximum performance. Where

additional PCI-E slots are available, two SAS HBAs should be used to redundantly

attach the I/O host to each storage array controller module to maximize both

performance and redundancy.

Note: Dell™ provides a bus layout on the lid of all servers. Consult this chart and

use a different bus for each HBA installed in the Host.

5.1.2 Sharing Bandwidth on the Dell™ MD3000i with Multiple NICs

Consider the following when sharing bandwidth on MD3000i with multiple NICs.

• Give each NIC its own IP address.

• Connect each NIC to a separate switch, or direct attach host NIC(s) to

target iSCSI port(s).

• Use separate NICs for public network access than the storage array iSCSI

session. Install additional NICs as needed.

• Ensure the use of separate redundant networks dedicated for iSCSI traffic,

if this is not possible, setup a separate VLAN for iSCSI traffic.

• Use Jumbo Frames (Jumbo Frames increase the TCP frame size from

1500 bytes to 9000 bytes).

• The Microsoft iSCSI initiator will not work with teamed NICs.

• A single Host cannot mix HBAs and NICs to connect to the same or

different arrays.

To edit the Jumbo Frames settings in the MDSM, select the iSCSI tab,

Configure iSCSI Host Ports, Advanced (see Figure 11). Jumbo Frames can be

also be set using the CLI. If using an MD3000i with Jumbo Frames, ensure the

Ethernet switches and host NIC(s) also have Jumbo Frames enabled and are set

to an equivalent value.

December 2008 – Revision A01

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