A reliability optimization method for RAID-structured storage systems based on active data migration

Yang, Yin; Tan, Zhihu; Wan, Jiguang; Xie, Changsheng; Yu, Jie; He, Jun

doi:10.1016/j.jss.2012.09.023

Cited by 1 publication

(3 citation statements)

References 24 publications

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“…In the design, the idea of hierarchical filter disk is used. This functional module provides filter frame and register interface, and other modules can call registeredinterface-install filter and filtering disk I/O provided by this module [29]. In the top level of disk I/O filter, disk read-write interface is provided for the rest modules of RAID system.…”

Section: A Disk Read-write Request Filtermentioning

confidence: 99%

“…Migration schedule controls the size of the migrated data, and migration bitmap describes which data blocks in the disk have been migrated successfully. If the migration occurs according to the sequence, migration bitmap needn't be used, because under this circumstance, detailed information about the migration of data block can be known by migration schedule, but disk I/O will be increased when the system is operating well, and using migration bitmap can prevent unnecessary disk I/O [29]. For example, in Fig.…”

Section: Data Migrationmentioning

confidence: 99%

“…Migration and actual synchronous writing unit is the synchronization of synchronous migration process and I/O operation to the disk. If synchronization unit is not used, data inconsistency will be caused under certain conditions [29]. Using Fig.…”

Section: Data Migrationmentioning

confidence: 99%

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Using active data repair and migration technologies for RAID-based storage systems

Yang¹,

Liang²,

Tan³

et al. 2014

JCP

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This paper proposes a new RAID-based system using Active data Repair and Migration technologies called RARM, which detects the status of sector, then allocates reserved space in every disk and arranges to redirect the data in the non-repairable sectors to the reserved space. If we ensure the reliability and utilization of disk, RARM will copy data of the low reliability disk or the number of the bad sectors in the disk exceeding threshold to a new one; it will also copy and redirect popularity data of the medium reliability and high utilization disk to the reserved space in high reliability disk or a new one, these process, as we called data migration can avoid lengthy data reconstruction. It can adjust migration speed to reduce the impact on the front end performance dynamically and prioritize user requests when the system I/O workload is bursting. The overall results indicate that the RARM can improve performance and reliability of the system with little influence.

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Section: A Disk Read-write Request Filtermentioning

confidence: 99%

Section: Data Migrationmentioning

confidence: 99%