
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 25 Display of RAID Viewer / raidcmd (Lost the redundancy of Logical Drive)
> raidcmd property -tg=pd -c=1 -p= e252s3
RAID Controller #1 Physical Device e252s3
Enclosure : 252
Enclosure Position : Internal
Slot : 3
ID : 20
Device Type : HDD
Interface : SAS
Vendor/Model : SEAGATE ST936701SS
Firmware Version : 0003
Serial Number : 3LC05RDP
Capacity : 33GB
Status : Online
S.M.A.R.T. : Normal
Power Status : On
>
> raidcmd property -tg=pd -c=1 -p= e252s2
RAID Controller #1 Physical Device e252s2
Enclosure : 252
Enclosure Position : Internal
Slot : 2
ID : 19
Device Type : HDD
Interface : SAS
Vendor/Model : SEAGATE ST936701SS
Firmware Version : 0003
Serial Number : 3LC047LG
Sector Format : 512
Capacity : 33GB
Status : Online
S.M.A.R.T. : Normal
Power Status : On
RAID Level: 5
> raidcmd property -tg=pd -c=1 -p= e252s4
RAID Controller #1 Physical Device e252s4
Enclosure : 252
Enclosure Position : Internal
Slot : 4
ID : 38
Device Type : HDD
Interface : SAS
Vendor/Model : SEAGATE ST3300657SS
Firmware Version : N007
Serial Number : 3SJ043P5
Sector Format : 512
Capacity : 33GB
Status : Failed
S.M.A.R.T. : Normal
Power Status : On
> raidcmd property -tg=ld -c=1 -l=1
RAID Controller #1 Logical Drive #1
ID : 0
Disk Array Information : 1 (order 1/1)
RAID Level : RAID 5
Sector Format : 512
Capacity : 135GB
Stripe Size : 256KB
Cache Mode (Setting) : Write Through
Cache Mode (Current) : Write Through
Type : Logical Drive
Status : Degraded
Structure and Status of RAID System
existence of
Device
123
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