Introduction to OceanStor 9000 data mirroring

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OceanStor 9000 data mirroring means that if the protection level of a directory is N+M, M+2 copies of metadata of files in the directory are stored in mirrors. When data is written to a file on OceanStor 9000, metadata for this file and multiple mirrors of metadata are generated and then written onto disks on OceanStor 9000 simultaneously. In total, M+2 data is written onto disks.

Other related questions:
Introduction to OceanStor 9000 V100R001C01 data balancing
OceanStor 9000 data balancing refers to the balancing of data capacity on storage nodes. After a disk or node is added, you can migrate it to make data evenly distributed on all storage nodes. OceanStor 9000 provides two modes of data balancing: - Manual balancing: After a data balancing task is manually started, the system checks whether data in each node pool is balanced in the system. If data is unbalanced, the system starts a data balancing task. - Automatic balancing: After a disk or node is added, the system waits 30 minutes and then starts a data balancing task. If the waiting time is shorter than 30 minutes and more disks or nodes are added, the system waits another 30 minutes before starting a data balancing task.

Introduction to the OceanStor 9000 NVDIMM
Non-Volatile Dual In-line Memory Module (NVDIMM) is a type of dual in-line memory module that saves data in case of power failures. Each OceanStor 9000 node is equipped with a 2 GB NVDIMM to ensure zero data loss in case of power failures.

OceanStor 9000 InfoAllocator feature definition
OceanStor 9000 InfoAllocator is a resource control technology. It restricts resources (including storage space and file number) available for users or user groups in a directory. InfoAllocator enables OceanStor 9000 administrators to: - Plan storage space or file number consumed by a user or a group in a proper way. - Manage storage space or file number that a user or a group consumes. - Make statistics on and check storage space or file number consumed by a user or a group.

Introduction to restriping in OceanStor 9000
Restriping means migrating data that has been stored to another tier or node pool.

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