360 Systems 2470SD Time Delay - Manual (Page 38)

38 Broadcast Time Delay
P 10 11 12
RAID Level 5:
“Independent Access Array with Rotating Parity”
High Data Reliability & Transfer Capacity
Disk 2 Disk 1 Disk 0 Disk 3
4 5 P 6
1 2 3 P
7 P 9 8
Disk Array
Controller
DATA
Array Management Software
Provides Logical to Physical Mapping
Physical
Figure 21: RAID 5 Array Schematic
Improved Write Performance
The Time Delay uses new designs to improve RAID-5 write performance for both large sequential and
small random transactions. This advanced block caching firmware delivers extremely high
performance for RAID-5 write operations.
Managing Disk Arrays
The Time Delay’s Disk Array Configuration Utility provides tools for monitoring and managing the
disk array. Monitoring and troubleshooting programs automatically check the array, report problems
and provide access to RAID status information and service options.
A single drive fault should not cause data loss; but remember: the drive array is degraded and no
longer has storage redundancy. Hence, another disk failure may cause a complete loss of data and
system failure. After a drive failure it is strongly recommended that at the earliest time diagnostics be
performed, and the server be taken off line while the RAID array is rebuilt.
Error Notification and Repair
The Time Delay will notify users in the event of a fault by flashing the front panel DRIVES DRIVES DRIVES DRIVES light. A
flashing DRIVES DRIVES DRIVES DRIVES light can be triggered by a variety of conditions. The first step in response to a
flashing light is to open the RAID CHECK STATUS window from the On-Screen Start Menu. Click
Start > System > RAID Status
to launch the Array Configuration Utility.
The RAID Status window (Figure 23) displays the current status of the RAID controller and all disks
connected to the RAID system. On inspection, you will find the array in one of the following states:
• OK, indicated by "OK" for Array Unit 0 and all Ports (drives);