Whether OceanStor 9000 reconstructs data using RAID 2.0-like methods after a disk fails

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If a disk fails, OceanStor 9000 reconstructs data using RAID 2.0+ or similar methods.

Other related questions:
Number of failed disks allowed by RAID 2.0+
The number of failed disks allowed by RAID 2.0+ depends on the RAID level. RAID 3 and RAID 5 only allow one disk to fail. RAID 6 and RAID 50 only allow two disks to fail. RAID 10 only allows N disks to fail (RAID 10 is composed of 2 x N disks).

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.

Whether OceanStor 9000 replicates the original data to the disk in the original slot after a new disk is installed
After the failed disk is replaced with a new one, OceanStor 9000 does not replicate the recovered data back to the new disk, but balances capacity.

V3 series storage capacity planning
For details about how to plan the capacity of V3 series storage, see Planning the Capacity of V3 Series Storage.

Method used to recover data on OceanStor 9000 V100R001C01
Based on failed objects and data recovery triggering conditions, OceanStor 9000 V100R001C01 recovers data using two methods: ensuring zero data loss on the original disk or node and writing the data in a failed disk or node to other normal disks or nodes through calculations.

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