Technical data

Acer | HDS AMS200 User and Reference Guide 35
2.4.6 Reliability
The reliability of the AMS200 is described in the following tables.
The following reliability does not change even when the RKNAS is connected to the system.
Table 2.13 Reliability of AMS200 Rack-Mount Model (RKS/RKAJ)
Rack-Mount Model Item Model
RKS RKAJ
MTBDL (Mean
Time Between Data
Lost)
(Note)
About 20 million hour or longer (in RAID 5 configuration)
RAID 6 configuration
n(n
−
1)(n
−
2)
×
Number of Parity group
×
MTTR
2
(MTBF of the disk drive)
3
RAID 5 configuration:
n(n
−
1)
×
Number of Parity group
×
MTTR
(MTBF of the disk drive)
2
RAID 0 configuration
n
×
Number of Parity group
MTBF of the disk drive
RAID 1 or RAID1+0 configuration
n
×
1
×
Number of Parity group
×
MTTR
(MTBF of the disk drive)
2
MTTR: Mean Time To Repair
n: Number of the mounted disk drive/Parity group
Drop in package
(JIS Z 0200-1997)
No abnormality must be caused by a free drop of level IV.
Radio frequency
radiation
Reliability
Instantaneous
power failure
10 ms (100% dip)
Note: The value of the MTBDL is calculated in the following configuration: RAID 5:68 sp
((15D+1P)(4group+4(spare)). This value varies on user's system configuration.