NEC N8100-1223F, User Manual

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Configuring Your Server 4-39
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 array controller
HDD 1 HDD 2
Stripe 1
HDD 3
Stripe 3
Stripe 1
Stripe 3
Stripe 2
Stripe 4
Stripe 5 Stripe 5 Stripe 6
HDD 4
Stripe 2
Stripe 4
Stripe 6
RAID1 RAID1
RAID0
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 array controller
HDD 1 HDD 2
Stripe 1
HDD 3
Stripe 6
Stripe 2
Parity (5, 6)
Parity (1, 2)
Stripe 5
Parity (9, 10) Stripe 9 Stripe 10
HDD 4
Stripe 3
Stripe 8
Parity (11, 12)
HDD 5 HDD 6
Stripe 4
Parity (7, 8)
Stripe 11
Parity (3, 4)
Stripe 7
Stripe 12
RAID1 RAID1
RAID0