Introduction to restriping in OceanStor 9000


Restriping means migrating data that has been stored to another tier or node pool.

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Functions of restriping in OceanStor 9000
Through restriping, data is stored based on file pool policies.

Principles for OceanStor 9000 restriping to take effect
Principles for OceanStor 9000 restriping to take effect: - Before restriping, OceanStor 9000 determines whether the used space of the node pool in the target tier reaches the read-only watermark. Restriping is implemented only when the used space is lower than the read-only watermark. If the used spaces of all node pools in the target tier are higher than the read-only watermark, restriping is stopped. - A restriping operation must not interrupt user access. If a user modifies data that is being restriped, the restriping operation stops and rolls back. The data that has been restriped to the new node pool is deleted and restriping will be performed later. - You must start another restriping operation after the current one is complete. For example, during the process of a file being restriped from tier 1 to tier 2, if the file poll policy changes and the file needs to be restriped to tier3, you must wait until the restriping to tier 2 is complete and then start the restriping to tier 3.

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.

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