6
Figure 7 RAID 1E
Application scenarios
RAID 1E is useful when high performance and data protection are more important than the cost of
physical drives.
Advantages
•
Has higher read performance than RAID 1 and mirrors data for an odd number of drives.
•
No data is lost as long as no failed drive is mirrored to another failed drive.
•
Up to half of the physical drives in the array can fail.
Disadvantages
•
This method is expensive as it needs many drives for fault tolerance.
•
Only half of the total drive capacity is usable for data storage.
•
Has lower security performance than RAID 10 when the same even number of drives are used
to create the array.
RAID 5
As shown in
, in RAID 5 configuration, data protection is provided by parity data (denoted
by P
x,y
). This parity data is calculated stripe by stripe from the user data that is written to all other
blocks within that stripe. The blocks of parity data are distributed evenly over every physical drive
within the logical drive.
Summary of Contents for UniServer B5700 G3
Page 35: ...19 Figure 29 Selecting the RAID volume to be deleted...
Page 116: ...56 Figure 96 Controller Configuration screen...
Page 220: ...61 Figure 109 Selecting Main Menu 2 Select Controller Management and press Enter...
Page 243: ...84 Figure 153 Confirming the operation...
Page 293: ...50 Figure 89 Clearing completion...
Page 382: ...21 Figure 27 Storage controller information...
Page 389: ...7 Figure 8 Identifying a storage controller 2...
