DVS Pronto4K, Hardware Manual

Page: 43 / 74

5-3
Maintenance
2
1
3
I
4
A
5
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 of the disk array (see section “Hard Disk Array” on page 2-6).
While performing continuous accesses to the data, it will be the one:
– no longer blinking (either continuously on or off),
– irregularly blinking compared to the other hard disks of the
same disk set, or
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 a RAID con-
troller. It cannot be switched mute with the mute button of the
operation items. It can be turned off either with the RAID soft-
ware manager 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 disks of the disk set. This can limit
the overall performance and real-time operations may no lon-
ger be possible.
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.
disk
se
t 1
disk set 2