Specifications

SCSI to SATA RAID Subsystem | Administrator’s Manual Data Integrity | en 151

Bosch Security Systems F.01U.027.802 | V1 | 2006.11

10 Data Integrity

This chapter discusses various firmware mechanisms that help to secure the integrity of array

data.

No system is completely safe from the threat of hardware faults. For example, although the

chance of occurrence is considerably low, the occurrences of bad blocks on two (RAID 5) hard

drives can fail a whole data set. When properly configured, the functions below help to mini-

mize the chance of data loss:

1. Event Triggered Operations (refer to Section 9 Enclosure Management)

2. <XREF>Failed Drive Detection

3. <XREF>Scheduled Maintenance

4. <XREF>Regenerate Logical Drive Parity

5. <XREF>Rebuild Priority

6. <XREF>Verification on Writes

10.1 Failed Drive Detection

10.1.1 Periodic Drive Check Time

The “Periodic Drive Check Time” is the time interval for the controller to check all disk drives

that were on the drive bus at controller startup (a list of all the drives that were detected can

be seen under “View and Edit Drives”).

The default value is “1 second.” If set to “Disabled,” it means that if a drive is removed from

the bus, the subsystem will not be able to know – so long as no host accesses that drive.

Changing the check time to any other value allows the controller to check – at the selected

time interval – all of the drives that are listed under “View and Edit Drives.” If any drive is then

removed, the controller will be able to know – even if no host accesses that drive.

Fig. 10.1 Set for Periodic Drive Check Time

Choose “Periodic Drive Check Time,” then press [ENTER]. Move the cursor to the desired

interval, then press [ENTER]. Choose Yes in the dialog box that follows to confirm the setting.

NOTICE!

• Some of the configuration options may not be available to all sub-revisions of firmware.

• All figures in this chapter are showing examples using the management hyper terminal

screen.