HIKVISION DS-81 Series User Manual

Storage System User Manual
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6. Select the Available HDDs to create RAID.
Or select Available arrays to create RAID.
Or select the combination of Available HDDs and Available arrays.
 Only enterprised HDDs are listed in Auailable HDDs list.
 In order to increase the performance of created RAID, it is recommended to use HDDs of the same
model and capacity when creating a RAID.
7. Click OK to create array. The successfully created array lists in Array information list. Once created, the array
starts initializing.
4.2.2 Array Exception
Purpose:
If HDD failure occurs, array degrades. When more HDDs fail, array fails. Degraded array can keep working.
However, failed array cannot work. Notification area will notify you once array degraded or failed. Refer to
following table for array degraded and failed condition.
Table 4. 4 Array Degraded Condition
RAID Level
Degraded Condition
Failed Condition
RAID 0
RAID 0 will not degrade.
One HDD fails.
RAID 1
N-1 HDDs fail.
All HDDs fail.
RAID 3
One HDD fails.
Two HDDs fail.
RAID 5
RAID 6
N-1 HDDs fail.
More than three HDDs fail.
RAID 10
One HDD fails.
Two HDDs fail in either contained RAID.
RAID 50
 If array in storage pool degrades, physical volume degrades.
 If array in storage pool fails, physical volume fails.
4.2.3 Rebuilding Array
Purpose:
Rebuilding refers to the process of using a normal HDD or array to virtually replace a failed HDD in a degraded
array. The normal HDD can be hot spare HDD, newly inserted HDD, and so forth.
 During rebuilding process, if the rebuilding HDD fails, the array stays degraded.
 During rebuilding process, if a normal HDD in array fails, the array becomes failed.
 During rebuilding process, if I/O error occurs to the rebuilding HDD, you need to change rebuilding HDD.
4.2.3.1 Rebuilding with Hot Spare
Before you start:

HIKVISION DS-81 Series Specifications

General

Brand	HIKVISION
Model	DS-81 Series
Category	Storage
Language	English