Compaq StorageWorks 4000 - RAID Array Guida Utente Scaricare il pdf (Pagina 160)

Hard Drive Arrays

The RA4000 Controller and the network operating system offer several other

fault management and data reliability features, including:

■

Auto reliability monitoring

■

Dynamic sector repairing

■

Drive parameter tracking

■

Drive failure alert features

■

Interim data recovery

■

Automatic data recovery

Auto reliability monitoring (ARM) is a background process that scans hard

drives for bad sectors in fault-tolerant logical drives. ARM also verifies the

consistency of parity data in drives with data guarding or distributed data

guarding. This process assures that you can recover all data successfully if a

drive failure occurs in the future. ARM operates only when you select

RAID 1, RAID 4, or RAID 5.

Using the dynamic sector repairing process, the controller automatically

remaps any sectors with media faults it detects either during normal operation

or during auto reliability monitoring.

Drive parameter tracking monitors more than 15 drive operational parameters

and functional tests. This includes parameters such as read, write, and seek

errors, spin-up time, cable problems, and functional tests such as track-to-track

seek time, one-third stroke, and full stroke seek time. Drive parameter tracking

allows the array controller to detect drive problems and predict drive failures

before they actually occur.

Drive failure features produce various drive alerts or error messages depending

on the Compaq server model. Refer to the documentation included with your

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Compaq StorageWorks 4000 - RAID Array Guida Utente Pagina 160