Huawei OceanStor 2000 V3 Series Features Manual page 90

OceanStor V3 Series
HyperMetro Feature Guide for File
Issue 05 (2018-01-30)
the number of disks increases. When the number of disks at a storage tier reaches
175, the storage tier uses the capacity of one disk in every 200 disks as the hot spare
space.
– None (not supported by 18000, 18000F series storage systems)
The system does not provide hot spare space.
Table 4-8 describes how hot spare space changes with the number of disks. The hot
spare space changes at a storage tier are used as an example here. The hot spare space
changes at different types of storage tiers are the same.
Table 4-8 Changes of hot spare space
Number of Disks
(1, 12]
(12, 25]
(25, 50]
(50, 75]
(75, 125]
(125, 175]
(175, 275]
(275, 375]
...
a: Huawei storage systems use RAID 2.0+ virtualization technology. Hot spare
capacity is provided by member disks in each disk domain. Therefore, the hot spare
capacity is expressed in number of disks in this table.
For example, if a disk domain is composed of 12 SSDs and the high hot spare policy
is used, the hot spare space occupies the capacity of one SSD and the capacity is
provided by member disks in the disk domain. If a disk domain is composed of 13
SSDs and the high hot spare policy is used, the hot spare space occupies the capacity
of two SSDs.
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Number of Disks of
Which Capacity Is
Used as Hot Spare
Space in High Hot
a
Spare Policy
1
2
3
4
5
6
7
8
4 Configuration
Number of Disks of
Which Capacity Is
Used as Hot Spare
Space in Low Hot
a
Spare Policy
1
2
3
4
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