Справочник Пользователя для IBM Flex System V7000 Expansion Enclosure 4939H29
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4939H29
Chapter 11. SAN Connections and Configuration
439
Draft Document for Review January 29, 2013 12:52 pm
8068ch11-SAN Config.fm
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If the Microsoft Windows clustered system is rebuilt or restored from a backup, hosts must
log off and then log back on to any previously connected iSCSI targets that are supplied
from the system.
log off and then log back on to any previously connected iSCSI targets that are supplied
from the system.
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If the host application uses SCSI 3 Persistent Reservation, you must run only a single
iSCSI session.
iSCSI session.
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Running with multiple iSCSI sessions is not supported for applications using Microsoft
2003 MSCS and Microsoft 2008 Failover clustering over an iSCSI interface; you must run
only a single session in these situations.
2003 MSCS and Microsoft 2008 Failover clustering over an iSCSI interface; you must run
only a single session in these situations.
11.3.4 iSCSI Multipath Connectivity
You can choose from several technologies to improve the availability of iSCSI by using
multiple network paths. Multipathing requires a software layer above the iSCSI layer to make
sense of the multiple physical paths between the initiator and target and to manage them
appropriately.
multiple network paths. Multipathing requires a software layer above the iSCSI layer to make
sense of the multiple physical paths between the initiator and target and to manage them
appropriately.
Within the IBM Flex System Enterprise Chassis I/O modules 1+2 will be populated by
Ethernet switches, these will allow iSCSI connectivity between a compute node and the IBM
Flex System V7000 Storage Node. It is important to configure for switch redundancy by using
iSCSI multipathing device driver software on the compute node host operating system. At the
IBM Flex System V7000 Storage Node canisters both iSCSI Ethernet ports should be used.
Ethernet switches, these will allow iSCSI connectivity between a compute node and the IBM
Flex System V7000 Storage Node. It is important to configure for switch redundancy by using
iSCSI multipathing device driver software on the compute node host operating system. At the
IBM Flex System V7000 Storage Node canisters both iSCSI Ethernet ports should be used.
In Figure 11-1 on page 434 it can be seen that NW 1 on each node canister is connected to
Switch 1 and Switch 2. When configuring for iSCSI connectivity as shown in Figure 11-5, port
2 is represented by the link to Switch 1 and port 3 is represented by the link to Switch 2
across both canisters.
Switch 1 and Switch 2. When configuring for iSCSI connectivity as shown in Figure 11-5, port
2 is represented by the link to Switch 1 and port 3 is represented by the link to Switch 2
across both canisters.
Figure 11-5 iSCSI ports 2 and 3 linking to switches in IBM Flex System Enterprise Chassis
At the host 4 paths can be configured to the IBM Flex System V7000 Storage Node using
each of the 2 Ethernet ports from each of the storage node canisters. In Figure 11-6 on
page 440 the example shows that both switches are used with separate networks or subnets,
each communicating with a storage node canister and a compute node.
each of the 2 Ethernet ports from each of the storage node canisters. In Figure 11-6 on
page 440 the example shows that both switches are used with separate networks or subnets,
each communicating with a storage node canister and a compute node.