Raid 6 Logical Drives - Adaptec Storage Manager User Manual

RAID 6 Logical Drives

Note: RAID 1E is an upgrade feature; if the RAID 1E feature is locked,
see Adding Enhanced Features on page 21
purchasing a feature key.
A RAID 6 logical drive is similar to a RAID 5 logical drive because it
uses data striping and parity data to provide redundancy. However,
RAID 6 logical drives include two independent sets of parity data
instead of one. Both sets of parity data are striped separately across all
disk drives in the logical drive.
RAID 6 logical drives provide extra protection for your data because
they can recover from two simultaneous disk drive failures. However,
the extra parity calculation slows performance (compared to RAID 5
logical drives).
RAID 6 logical drives must be built from four or more disk drives, to a
maximum of sixteen. Maximum stripe size depends on the number of
disk drives in the logical drive.
Disk Drive 1 250 GB
Disk Drive 2 250 GB
Disk Drive 3 400 GB
Disk Drive 4 400 GB
Disk Drives in Logical Drive
Appendix D: Understanding RAID
Drive Segment Size (Smallest Disk Drive)
Disk Drive 1 1 P1 ...
Disk Drive 2 2 P2 ...
Disk Drive 3 P1 3 ...
Not Used
Disk Drive 4 P2 4 ...
Not Used
RAID 6 Logical Drive = 500 GB plus Parity (P1 & P2)
for information on
P2
449
P1
Unused Space: 150 GB
500
Unused Space: 150 GB
171