Iomega STORCENTER IX12-300R User Manual

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WHITE PAPER

IOMEGA® STORCENTERTM ix12-300r

ADVANCED NETWORK CONFIGURATION GUIDE

 

 

Introduction

1

Terminology

2

VLAN Configuration

3

NIC Bonding Configuration

3

Jumbo Frame Configuration

4

Other I/O High Availability Options

5

Configuration Procedure

6

Conclusion

10

SPRING 2010

IOMEGA STORCENTER IX12-300R ADVANCED NETWORK CONFIGURATION GUIDE

INTRODUCTION

The Iomega® StorCenterix12-300r network storage array offers versatile storage provisioning, advanced protocol capabilities, expandability, and affordability in an easy-to-use product ideal for small businesses, workgroups, and departments. Based on enterprise-class EMC® storage technology, the StorCenter ix12-300r provides quad gigabit Ethernet connections, direct or network attach, easy file sharing, iSCSI block access, multiple RAID configurations for optimized data protection, and storage pools for application flexibility and expandability to match your budget. Business users will appreciate the robust data protection features, such as UPS support; print serving; folder quotas; rsync device-to-device replication; and user replaceable hot swap fans, power supplies, and drives for business continuity and disaster recovery. The easy-to-use interface, Active Directory support, and remote access provide no-hassle management. The StorCenter ix12-300r supports PC, Mac® , Linux® and UNIX clients and is VMware® certified for NFS and iSCSI and Microsoft Windows Server 2008 R2 (Hyper-V) certified for iSCSI.

A Virtual LAN (VLAN) is a group of hosts with a common set of requirements that communicate as if they were attached to the same broadcast domain regardless of their physical location. A VLAN has the same attributes as a physical LAN, but does not require the hosts to be located on the same network switch. Like routers in LAN configurations, VLANs are created to provide segmentation services to address issues such as scalability, security, and network management.

NIC bonding (also known as NIC teaming, link aggregation, trunking, among others) is a computer networking technology that uses multiple network cables and ports in parallel to increase the link speed beyond the limits of any one single cable or port, and to increase the network redundancy for higher availability.

Standard Ethernet frames contain 1500 bytes of payload, or Maximum Transmission Unit (MTU). Jumbo Frames can normally carry up to 9000 bytes of MTU, although variations exist. By increasing the frame size, the same amount of data can be transferred in fewer frames, therefore reducing hardware and software processing overhead and improving network efficiency.

This white paper discusses the advanced network capabilities available on the StorCenter ix12-300r, including VLAN, NIC bonding, and Jumbo Frame, and how to configure them to fully take advantage of these enterpriseclass technologies. The paper includes detailed instructions and procedures to help users plan and configure the StorCenter ix12-300r network settings and the corresponding network infrastructure.

White Paper

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IOMEGA STORCENTER IX12-300R ADVANCED NETWORK CONFIGURATION GUIDE

TERMINOLOGY

LAN: Local Area Network.

NIC: Network Interface Card (a.k.a. Network Adapter)

Virtual NIC: Virtual network interface card. In this paper, it refers to a VLAN or bonded NIC device.

NAS: Network Attached Storage. The name given to dedicated data storage technology that can be connected directly to a computer network to provide centralized data access and storage to heterogeneous network clients.

NIC bonding: a computer networking technology that uses multiple network ports/cables in parallel to increase the link speed beyond the limits of any one single port/cable and to increase the redundancy for higher availability. Other similar terms include NIC teaming, link aggregation, Ethernet trunking, etc.

VLAN: Virtual LAN. A Virtual LAN (VLAN) is a group of hosts with a common set of requirements that communicate as if they were attached to the same broadcast domain, regardless of their physical location. A VLAN has the same attributes as a physical LAN, but does not require the hosts to be located on the same network switch.

MTU: Maximum Transmission Unit, sometimes also referred to as payload. This is the size of the largest protocol data unit that a computer networking layer can transmit.

Jumbo Frame: an Ethernet frame that carries more than the standard 1518 bytes of MTU.

IEEE 802.3ad: a NIC bonding protocol referred to by its IEEE workgroup name.

IEEE 802.1Q: also known as VLAN Tagging, is a networking standard written by the IEEE 802.1 workgroup to allow multiple bridged networks to transparently share the same physical network link without leakage of information between networks.

REFERENCES

1.Intel Advanced Networking Services With Ethernet Teaming, http://support.dell.com/support/edocs/network/9195p/en/Intel_nic_teaming_10.pdf

2.Using Microsoft MPIO with Iomega StorCenter for iSCSI High Availability, http://download.iomega.com/com/nas/pdfs/mpio-iscsi.pdf

3.Using Iomega StorCenter ix4-200d NAS Server with VMware vSphere 4, http://download.iomega.com/com/nas/pdfs/vsphere_0110.pdf

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IOMEGA STORCENTER IX12-300R ADVANCED NETWORK CONFIGURATION GUIDE

VLAN CONFIGURATION

VLAN is essentially a Layer 2 (Data Link Layer) construct, while an IP subnet is a Layer 3 (Network Layer) construct. In an environment employing VLAN, a many-to-many relationship can exist between VLANs and IP subnets. It is possible to have multiple subnets on one VLAN or have one subnet spread across multiple VLANs.

The protocol most commonly used today in VLAN configuration is IEEE 802.1Q. Other proprietary protocols exist, such as Cisco’s Inter-Switch Link (ISL) and 3Com’s Virtual LAN Trunk (VLT). To use VLAN on a network interface, the network switch port that the interface is physically connected to must be tagged accordingly. This normally requires the service of a network administrator.

The StorCenter ix12-300r implements IEEE 802.1Q, or VLAN Tagging, to provide the best interoperability. Each of the four physical interfaces can have up to four VLANs tagged in addition to its existing network configuration. Therefore, each network interface can have a maximum of five IP addresses associated with it. There are many benefits of using VLAN in a business environment, these benefits include:

t Increased performance: Grouping users performing similar functions or within individual workgroups into logical networks will help reduce network collision over the switched network and also limit the broadcast traffic. Moreover, the latency added by routers will be reduced since less traffic will need to be routed between the logical networks.

t Improved manageability: VLAN removes dependency on the physical network and topology by creating a logical network to connect physically diverse workgroups within a single broadcast domain. It’s easy, flexible, and less costly to modify a logical network in changing environments. Large networks can be managed centrally regardless of physical locations of devices.

t Network tuning and simplification of configurations: Administrators can fine-tune the network infrastructure at a more granular level without disrupting other logical networks. When network issues arise, administrators can quickly isolate the problematic network to identify the root cause. Additionally, software configurations can be standardized and deployed easily across computers and users within the same network.

t Enhanced security: Segmenting users into separate VLANs helps restrict user access to sensitive information at the network layer, providing an extra layer of data security. Traffic between VLANs can be easily controlled using router features such as access lists.

NIC BONDING CONFIGURATION

NIC bonding addresses two problems with Ethernet connections: bandwidth limitations and lack of redundancy. Ethernet bandwidth requirements do not scale linearly; they have historically increased by an order of magnitude each generation (10/100/1000/10000 Mbit/sec Ethernets). When the network bandwidth ceiling is reached, upgrading to the next generation is very expensive. The alternative solution is to combine two or more physical Ethernet links into one logical link for an aggregated bandwidth. In a typical port-cable-port connection, there are three single points of failure whether the connection is between computer and switch or between switches. NIC bonding provides a solution to this problem by eliminating the single points of failure. Failover can happen automatically in the event of a port or cable failure.

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