Specifications

5-3

Maintenance

Figure 5-1: Disk sets (RAID packs) of the hard disk array

With the available RAID feature the DVS system can withstand disk fail-

ures without losing data or access to data.

5.1.2 Identifying a Broken Hard Disk

In case of an alarm or when suspecting a worn hard disk, you have to

identify the broken hard disk first in order to replace it.

In most cases you can find the broken disk by simply observing the

LEDs on the hard disk carriers (see section “Hard Disk Array” on

page 2-7). While performing continuous accesses to the data, it will be

the one:

– no longer blinking (either continuously on or off),

An alarm can be caused by a number of reasons. Please refer

to section “Troubleshooting” on page A-2 first for further de-

tails about what to do in case of an alarm.

If a hard disk fails, the alarm will be sounded by the RAID con-

troller. It can be turned off either with the RAID software man-

ager or by replacing the broken hard disk.

Data accesses to the hard disk array are still possible because

any missing data will be recalculated from the parity informa-

tion stored on the other hard disk(s). This can limit the overall

performance and real-time operations may no longer be possi-

ble.

Replace the failed disk as soon as possible. If you do not re-

place a broken disk in time and another disk fails in the mean-

time, your data may be unrecoverable.

Before replacing a hard disk you have to gather the log files of

the RAID controller. If you know how to do this you may pro-

ceed on your own. If not, please contact the DVS service de-

partment first.

system/metadata disks main storage disks