Functions of restriping in OceanStor 9000


Through restriping, data is stored based on file pool policies.

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

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.

OceanStor 9000 metadata functions
Metadata is a type of data that defines data, describes data properties, and supports functions of indicating storage locations and historical data, querying resources, and recording files. In a file system, the relationship between metadata and file data is similar to that between a control plane and a data plane.

OceanStor 9000 InfoTier feature definition
InfoTier, which is also named dynamic storage tiering (DST), can store files on storage devices with different performance levels according to the file properties, and can migrate files between devices. In this way, InfoTier fits users' requirements on the files processing speed and storage capacity, and ensures optimized space utilization, enhanced access performance, and reduced total deployment cost.

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