HP NetServer AA 6200, Руководство администратора

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Endurance Overview 2-3
• Each IOP requires a licensed copy of the Windows operating system that should be
accessed only to perform maintenance procedures.
In addition to the concepts described in Chapter 1, the Endurance fault tolerant technology
coordinates all I/O requests and responses between the CEs and IOPs using the ESIs and the IL,
as shown in
Figure 2-1 .
• In the Endurance server, the ESIs (Endurance System Interconnects) provide the
interconnect paths for all Endurance server I/O requests and responses. These paths
connect the IOPs to the CEs as follows:
- ESI11 is the path from IOP1 to CE1.
- ESI12 is the path from IOP1 to CE2.
- ESI21 is the path from IOP2 to CE1.
- ESI22 is the path from IOP2 to CE2.
• The IL (IOP Link) is a dedicated private network for completing mirror copies
(transferring mirrored disk data) between the IOPs, and for communication between the
IOPs. The IL is physically supported by connecting two Ethernet adapters, one in each
IOP.
Figure 2-1 Interconnect Paths in the Endurance Server
CE 1 CE 2
IOP 1 IOP 2
The ESI is the I/O data
path between the CE
and redirected devices
on the IOPs.
Local Area Network
The IL is the mirror
copy data path
between the IOPs.
CE 2
CE 2 CE 1
IOP 1 IOP 2
IOP 1 IOP 2
CE 1
IOP Link (IL) Endurance System Interconnects
(ESI)