Configuring Your Server 4-27
RAID5
In RAID5, data is distributed to HDDs by striping and, at the same time, the parity (redundant data)
is distributed to the HDDs. This mode is called "striping with distributed parity".
Each of stripe x, stripe x+1, and parity (x, x+1) created from stripe x and stripe x+1 is written onto a
specific HDD. Accordingly, the total capacity assigned to the parity is just the same as the capacity
of a single HDD. If any one of the HDDs configuring a logical drive is defected, data is still
available with no problems.
RAID Controller
HDD 1
HDD 2
HDD 3
Stripe 2
Parity (3, 4)
Stripe 5
Parity (1, 2)
Stripe 3
Stripe 6
Stripe 1
Stripe 4
Parity (5, 6)
RAID6
A RAID 6 extends RAID 5 by adding an additional parity block (Q) created by different calculation
method such as weighting by some factor, thus it uses block-level striping with two parity blocks
distributed across all member disks. This mode is called "striping with duplex and distributed
parity". Accordingly, the total capacity assigned to the parity is just the same as the capacity of two
HDDs. If any two of the HDDs configuring a logical drive are defected, data is still available with
no problems.
RAID Controller
HDD 1
HDD 2
Stripe 1
HDD 3
Stripe 4
Stripe 2
Parity P (3,4)
Parity P (1,2)
Parity Q (3,4)
Parity P (5,6)
Parity Q (5,6)
Stripe 5
HDD 4
Parity Q (1,2)
Stripe 3
Stripe 6
Parity Q (7,8)
Stripe 7
Stripe 8
Parity P (7,8)
Summary of Contents for N8100-1417F
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Page 36: ...2 8 General Description Rear View 1 2 3 4 5 6 7 8 9 10 11 12 13 1 14 12 14 12 14 13 3 13 2 15...
Page 143: ...Configuring Your Server 4 75 3 Setting menu for VD 0 is displayed...
Page 220: ...7 12 Maintenance This page is intentionally left blank...
Page 352: ...9 94 Upgrading Your Server This page is intentionally left blank...
Page 353: ...Chapter 10 Internal Cabling Diagrams Internal cable connections of the server are shown below...
Page 360: ...10 8 Internal Cabling Diagrams This page is intentionally left blank...
Page 362: ...A 2 Specifications This page is intentionally left blank...
Page 370: ...C 2 IRQ This page is intentionally left blank...
Page 426: ...F 2 Using a Client Computer Which Has a CD Drive This page is intentionally left blank...
Page 430: ...G 4 Product Configuration Record Table This page is intentionally left blank...