LSI MegaRAID SCSI 320-2 RAID Controller Series 518 - Manual (Page 43)

RAID 50 3-7
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
Figure 3.4 RAID 10 Array
3.6 RAID 50
RAID 50 provides the features of both RAID 0 and RAID 5, including both
parity and disk striping across multiple drives. RAID 50 is best
implemented on two RAID 5 disk arrays with data striped across both
disk arrays. RAID 50 breaks up data into smaller blocks, and then stripes
the blocks of data to each RAID 5 RAID set. RAID 5 breaks up data into
smaller blocks, calculates parity by performing an exclusive-or on the
blocks, and then writes the blocks of data and parity to each drive in the
array. The size of each block is determined by the stripe size parameter,
which is set during the creation of the RAID set.
RAID 1
Disk 2
Data Flow
Disk 1 Disk 4 Disk 3
RAID 1
RAID 0
Segment 1
Segment 3
Segment 5 Segment 1
Segment 3
Segment 5 Segment 2
Segment 4
Segment 6 Segment 2
Segment 4
Segment 6 Segment 2
Segment 4
Segment 6
MegaRAID Controller