Toshiba QOSMIO G20 manual Operation of Independent utility, Outline of Independent utility

J.3Operation of Independent utility Appendix J Maintenance of TOSHIBA RAID

J.3 Operation of Independent utility

J.3.1 Outline of Independent utility

This is a utility to display Drive Log of TOSHIBA RAID.

(1)Drive Log

TOSHIBA RAID can store about 7,000 logs of Drive Log.

TOSHIBA RAID make Drive Log redundant and store it. The drive has own log and other drive’s log.

In TOSHIBA RAID, the log of own drive is called “Own Log” and the redundant log of other drive’s drive is called “Redundant Log”. Each port has “Own Log” and “Redundant Log”. As shown in the following figure, the Port 0 has “Own Log” of Port0 and “Redundant Log” of Port1. The Port1 has “Own Log” of Port1 and “Redundant Log” of Port0.

RAID-0 or RAID 1

Port0Port1

Data area Data area

Redundant

Own Log	Own Log	Reserved area
Redundant Log	Redundant Log	(About 2MB)

Figure J-3 Drive Log

(2) Information of Drive Log

TOSHIBA RAID writes the log when any change in RAID array or an error occurs. So, seeing the log can trace the history of the array or error information. In TOSHIBA RAID, about 7,000 logs can be stored and the past logs can be referred in detail.

J-8 [CONFIDENTIAL] QOSMIO G20 Maintenance Manual (960-511)