Compaq ProLiant 7000 SMART-2DH Array Controller Reference Guide - Page 174

G-6 Recovering from Drive Failure Automatic Data Recovery Failure During Automatic Data Recovery, if the online LED of the replacement drive stops blinking and all other drives in the array are still online, the Automatic Data Recovery process may have been abnormally terminated due to an noncorrectable read error from another physical drive during the recovery process. The background Auto-Reliability Monitoring process is meant to help prevent this problem, but it cannot do anything about certain issues such as SCSI bus signal integrity problems. Reboot the system and a POST message should confirm the diagnosis. Retrying Automatic Data Recovery may possibly help. If not, a backup of all data on the system, surface analysis (using User Diagnostics), and restore is the recommended course of action in this unfortunate situation. During Automatic Data Recovery, if the online LED of the replacement drive stops blinking and the replacement drive is failed (amber failure LED illuminated or other LEDs go out), the replacement drive is producing unrecoverable disk errors. In this case, the replacement drive should be removed and replaced with another replacement drive. Compromised Fault Tolerance If fault tolerance is ever compromised due to failure of multiple drives, the condition of the logical drive will be "failed" and "unrecoverable" errors will be returned to the host. Data loss is probable. Insertion of replacement drives at this time will not improve the condition of the logical drive. If this occurs, first try turning the entire system off and on. In some cases, an intermittent drive will appear to work again (perhaps long enough to make copies of important files) after cycling power. If a 1779 POST message is displayed, press F2 to reenable the logical drive(s). Remember that data loss has likely occurred and any data on the logical drive is suspect. Fault tolerance may be compromised due to non-drive problems such as a faulty cable, faulty storage system power supply, or a user accidentally turning off an external storage system while the host system power was on. In such cases, the physical drives do not need to be replaced. However, data loss can still occur in this situation, especially if the system was busy at the time the problem developed. Writer: Pamela King Project: SMART-2DH Array Controller Reference Guide Comments: 295469-002 File Name: N-APPG.DOC Last Saved On: 2/27/98 12:09 PM COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED