Spanning Of Raid1; Spanning Of Raid5 - NEC N8103-91 User Manual

94

2-5. Spanning of RAID1

Data to be recorded is distributed to two HDDs in mirroring mode. Then, each mirrored
data is written onto HDD by striping. Owing to this feature, high disk access performance
of RAID0 and, in addition, high reliability of RAID1 can be achieved.
Disk 1
Stripe 1
Stripe 3
Stripe 5

2-6. Spanning of RAID5

Data is distributed to HDDs by striping with distributed parity, and then written onto HDDs
by striping. Owing to this feature, high disk access performance of RAID0 and, in addition,
high reliability of RAID5 can be achieved.
Disk 1
Stripe 1
Stripe 6 Parity (5, 6)
Parity (9, 10)
Disk array controller
Disk 2
Stripe 1
Stripe 3
Stripe 5
RAID1
Disk array controller
Disk 2 Disk 3
Stripe 2 Parity (1, 2)
Stripe 5
Stripe 9 Stripe 10
RAID5
Disk 3
Stripe 2
Stripe 4
Stripe 6
RAID1
RAID0
Disk 4
Stripe 3
Stripe 8
Parity (11, 12)
RAID0
Disk 4
Stripe 2
Stripe 4
Stripe 6
Disk 5 Disk 6
Stripe 4 Parity (3, 4)
Parity (7, 8) Stripe 7
Stripe 11 Stripe 12
RAID5