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Operation when redundancy of Logical Drive degraded or lost due to failure of Physical Device

If one or more Physical Devices used by a Logical Drive are failed (with their [Status] being [Failed]) to degraded (one Physical Device of RAID Level 6 is failed) or lost (one Physical

Device of RAID Level 1 or 5 is failed, two Physical Devices of RAID Level 6 is failed) the redundancy of the Logical Drive, the Logical Drive is degraded (with its [Status] being

[Degraded]).

Figure 23 Display of RAID Viewer / raidcmd (Lost the redundancy of Logical Drive)

> raidcmd property -tg=pd -c=1 -p=2

RAID Controller #1 Physical Device #2

ID : 0

Enclosure : 1

Slot : 2

Device Type : HDD

Interface : SAS

Vendor/Model : Seagate ST12345678

Firmware Version : BK09

Serial Number : 1111

Capacity : 146GB

Status : Online

S.M.A.R.T. : Normal

> raidcmd property -tg=pd -c=1 -p=1

RAID Controller #1 Physical Device #1

ID : 0

Enclosure : 1

Slot : 1

Device Type : HDD

Interface : SAS

Vendor/Model : Seagate ST12345678

Firmware Version : BK09

Serial Number : 1111

Capacity : 146GB

Status : Online

S.M.A.R.T. : Normal

[Hot Spare]

[Failed]

#1 [Degraded]

RAID Level: 5

[Online]

> raidcmd property -tg=pd -c=1 -p=3

RAID Controller #1 Physical Device #3

ID : 2

Enclosure : 1

Slot : 3

Device Type : HDD

Interface : SAS

Vendor/Model : Seagate ST12345678

Firmware Version : BK09

Serial Number : 1111

Capacity : 146GB

Status : Failed

S.M.A.R.T. : Normal

> raidcmd property -tg=ld -c=1 -l=1

RAID Controller #1 Logical Drive #1

ID : 0

Physical Device Number : 1, 2, 3

Disk Array Number : 1

RAID Level : 5

Stripe Size : 64KB

Capacity : 146GB

Cache Mode (Current) : Write Back

Cache Mode (Setting) : Auto Switch

Status : Degraded

Structure and Status of RAID System

Tree View of RAID Viewer

Property of RAID Viewer

Property of raidcmd

Logical Drive

[Degraded]

Become [Fatal] by

existence of

[Failed] node.

Failed Physical

Device

[Failed]

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 105 106

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