Storing redundant data on dedicated disks or nodes or providing redundancy between disks during data protection on OceanStor 9000

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OceanStor 9000 does not store redundant data on any dedicated hot-spare disks or nodes for data protection. All storage nodes are provided for the same purpose. Raw data and redundant data are evenly stored on all nodes and disks of OceanStor 9000 which are available as recovery resources.

Other related questions:
What's the Category for data redundancy ratios on OceanStor 9000?
Support for multiple redundancy ratios such as +1, +2, +3, +4, +2:1, and +3:1.

Whether battery backup unit (BBU) data can be stored in coffer disks of OceanStor T Series unified storage
The BBU data cannot be stored in coffer disks of OceanStor T Series unified storage. Instead, it is stored in an SSD of the management card.

OceanStor 9000 V100R001C01 data recovery for a failed disk
OceanStor 9000 V100R001C01 recovers data for a failed disk using the following methods: 1. If the disk has been offline for at most 10 minutes and has turned offline for no more than four times within 10 minutes, OceanStor 9000 V100R001C01 updates data changes within the offline duration to a normal disk and ensures zero loss of original data on the failed disk. 2. If the disk has been offline for over 10 minutes or has returned offline for five times within 10 minutes, or the failed disk cannot be restored and cannot go online again, OceanStor 9000 V100R001C01 obtains the data on the failed disk through calculations and writes the data to other normal disks.

Functions of coffer disks of unified storage
Coffer disks of unified storage store the configuration data of the storage system, events, logs, and dirty data. Remaining capacity of coffer disks can be used to store storage service data.

Redundancy ratios supported by OceanStor 9000
OceanStor 9000 supports +1, +2, +3, +4, +2:1, and +3:1 redundancy ratios.

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