IBM Midrange System DS4000 Series Hardware Manual page 87

Midrange system storage ds4000/ds5000 series

Hide thumbs Also See for Midrange System DS4000 Series:

Table of Contents

The optional dual-ported 8 Gbps Host Interface Card (HIC), shown in Figure 3-42, uses an

two port FC chip. This chip connects via PCI-E x8 to the XOR engine.

Figure 3-42 DS5020 Dual-Port 8 Gbps HIC architecture

If you have the iSCSI option, as shown in Figure 3-43, there is an QLogic top-off-engine

(TOE) build into the DS5020. It will be built in as a daughter card of the controller mainboard.

It reduces the workload of the controller CPU by calculating the whole Ethernet traffic and

transfers just the SCSI packet through it.

PCI-X to PCIe

Figure 3-43 DS5020 iSCSI HIC architecture

Because of the similarities between the DS5000 controller models, we refer to 3.4.1, "DS5100

and DS5300 controller architecture" on page 31 for details about write cache, cache handling,

write operations, and cache block flow.

QLogic EP4032

64b/133MHz PCI-X

Chapter 3. IBM System Storage DS4000 and DS5000 hardware

DDR Reassembly