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)
Содержание N8100-1417F
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Страница 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...
Страница 108: ...4 40 Configuring Your Server The detailed settings is continued to the next page Click Next to view more information...
Страница 119: ...Configuring Your Server 4 51 Use this menu to define several physical drives PD as a disk group DG...
Страница 143: ...Configuring Your Server 4 75 3 Setting menu for VD 0 is displayed...
Страница 195: ...Installing and Using Utilities 6 9 4 Click Parameter File Creator Parameter File Creator will appear...
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Страница 300: ...9 42 Upgrading Your Server Removal Remove the HDD cage in the reverse procedure of the installation...
Страница 316: ...9 58 Upgrading Your Server Removal Remove the 5 25 inch device in the reverse procedure of the installation...
Страница 352: ...9 94 Upgrading Your Server This page is intentionally left blank...
Страница 353: ...Chapter 10 Internal Cabling Diagrams Internal cable connections of the server are shown below...
Страница 360: ...10 8 Internal Cabling Diagrams This page is intentionally left blank...
Страница 362: ...A 2 Specifications This page is intentionally left blank...
Страница 370: ...C 2 IRQ This page is intentionally left blank...
Страница 426: ...F 2 Using a Client Computer Which Has a CD Drive This page is intentionally left blank...
Страница 430: ...G 4 Product Configuration Record Table This page is intentionally left blank...