IBM System Storage DS4000, Hardware Maintenance Manual, Page: 85 / 184

Symptom-to-FRU index
The Symptom-to-FRU index (Table 27) lists symptoms and the possible causes. The
most likely cause is listed first.
The PD maps found in the IBM TotalStorage DS4000 Problem Determination Guide
also provide you with additional diagnostic aids.
Note: Do not look directly into any fiber cable or GBIC optical output. To view an
optical signal, use a mirror to view the reflected light.
Table 27. Symptom-to-FRU index for FAStT500 RAID controller
Problem Action/FRU
Controller LED (front cover)
is on.
1. Reseat Controller CRU.
2. Place Controller online using DS4000 Storage Manager
GUI.
3.
If in passive mode, check Fibre path/GBIC.
4.
Controller CRU
Software issued a controller
error message.
1. Check Controller Fan
2. Controller CRU
Software errors occur when
attempting to access
controllers or drives.
1. Check appropriate software and documentation to
make sure the system is set up correctly and the proper
command was run.
2. Power to the Controller
3.
Interface cables
4.
ID settings
5. Controller
6. Drive
7. Controller backpanel
Note 1: Mirroring is done over IP using Gigabit ethernet
Note 2: Requires Legato LME and MSCS
Legato HA/Replication for MSCS
Primary writes over FCP
Client Interconnect
Private Interconnect
Primary writes over FCP
Mirrored writes over IP
Site A Site B
Up to 10Km
FC-AL
Ethernet, Token Ring, etc.
Gigabit Ethernet
Figure 44. FAStT500 RAID controller Legato HA/replication for MS
Chapter 8. Type 3552 FAStT500 RAID Controller
57