Raid 50 Arrays - Adaptec RAID 3085 Installation And User Manual

RAID 50 Arrays

A RAID 50 array is built from six to forty-eight disk drives configured as two or more RAID 5
arrays, and stripes stored data and parity data across all disk drives in both RAID 5 arrays. (For
more information, see
Note:
Because they support four disk drives only, the Adaptec 2420SA RAID controller can't
support RAID 50 arrays.
The parity data provides data protection, and striping improves performance. RAID 50 arrays
also provide high data transfer speeds.
Drive segment size is limited to the size of the smallest disk drive in the array. For example,
three 250 GB disk drives and three 400 GB disk drives comprise two equal-sized RAID 5 arrays
with 500 GB of stored data and 250 GB of parity data. The RAID 50 array can therefore contain
1000 GB (2 x 500 GB) of stored data and 500 GB of parity data.
In this figure, P represents the distributed parity data.
1, 5, P
Drive 1
250 GB
RAID 5 Arrays on page
RAID 50
Logical Drive
=
1000 GB
plus Parity
Each RAID 5 Logical Drive has
RAID 5
500 GB Data Storage
A
250 GB Parity Data
3, P , 9 P , 7, 11
Drive 2 Drive 3
250 GB 250 GB
Appendix B: Understanding RAID
79.)
RAID 5
B
2, 6, P 4, P , 10 P , 8, 12
Drive 4 Drive 5 Drive 6
400 GB 400 GB 400 GB
81
●
Total Unused
Space = 150 GB