321 Studios GHDX2-2430S-24F4D manual Direct-attached Connections with Data Link Fault Tolerance

Chapter 4: Subsystem Connection and Operation
Drive	Via system bus, through the backplane
4th DIP Switch	Hub enabled/disabled
Configuration Information
RAID Controllers	2
Application Servers	2
Data path Connection	Fault-tolerant paths
Host Channel Bandwidth	800 MBps
Max. Number of Drives	24

•This is a direct-attached configuration showing two (2) host computers sharing the storage volume of one (1) RAID subsystem. Disk drives in the enclosure can be configured into one or more arrays, and made available through individual host ports.

•Operating system(s) might boot from the array. Operating using a protected capacity decreases the chance of server downtime. The logical arrays can be associated with different controller IDs on different host channels so that if a cable link fails, the host can still access the arrays through another channel link. File locking or access management utilities will be necessary to avoid access conflicts.

•Depending on I/O characteristics, each configured array should be properly optimized either for Random or Sequential I/Os.

•Multiple logical drives or multiple RAID partitions can be created and made available separately through different ID/LUNs on the host ports.

4.4.2Direct-attached Connections with Data Link Fault Tolerance

This is a direct-attached configuration making use of all connection points and shares storage with four (4) host computers, each of the host computers with two

(2) single-ported HBAs for path redundancy.

Subsystem Connection and Operation 4-15