Red Hat DEVICE-MAPPER MULTIPATH 4.6 Instrukcja Użytkownika Pobierz pdf (Strona 12)

Chapter 3 Notes

> 3.3 LAN Switch Connection Notes

ETERNUS Disk storage systems Server Connection Guide (iSCSI) for Linux

(Red Hat Enterprise Linux)

P3AM-4142-02ENZ0

3.3 LAN Switch Connection Notes

• As with an FC-SAN, because of the large data flows (traffic volumes) the iSCSI LAN is

assumed to be a dedicated LAN separate from the business and management LANs, and

constructed with its own LAN switch.

• The iSCSI connection LAN should only contain 1000BASE-T compatible devices.

• iSCSI LAN redundancy is achieved by the use of multipaths.

• For IP network security reasons too, it is useful to separate the iSCSI LAN (for data transfers)

and management LAN (for administration) to prevent cross-access between them (use of

VLAN to separate the LAN segments is recommended).

Example LAN switch connection configuration

*1: In this system configuration, multipaths provide redundant connections between the servers and

storage system. LAN switches #1 and #2 provide physical separation of the network paths.

*2: A separate LAN segment is provided in the LAN switch (using the switch VLAN function) for each

grouping of business servers and disk storage systems (equivalent to the FC zones).

Business server A

LAN

card

LAN

card

Business server B

LAN

card

LAN

card

Business server C

LAN

card

LAN

card

LAN

card

LAN switch

[Business LAN]

LAN switch

[Management LAN]

ETERNUS Disk storage system

LAN switch #1

[iSCSI LAN]

1 2 3

10 11 12

LUN1 LUN2

2 3

LAN switch #2

[iSCSI LAN]

LAN

card

LAN

card

LUN3

Management

LAN port

LAN switches should not

be inter-connected (*1)

A separate LAN segment is used for each

Server/Storage grouping. (*2)

Here, LAN ports 1, 2 and 10 comprise VLAN1,

while LAN ports 3 and 11 comprise VLAN2.

The iSCSI LAN and management

LAN segments are kept separate

in the iSCSI LAN switches, helping

maintain the security of each.

Similarly to FC-SAN, a

dedicated LAN is used for

iSCSI, not the business LAN.

Business LAN

iSCSI LAN

Management LAN

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 24 25

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