RAID 5 rebuild performance in ProLiant
ثبت نشده
چکیده
............................................................................................................................................. 2 Overview of the RAID 5 rebuild process ................................................................................................. 2 Estimating the mean-time-to-failure (MTTF) ............................................................................................... 3 Factors affecting RAID 5 array rebuild performance................................................................................. 3 Array size ....................................................................................................................................... 4 RAID stripe size ............................................................................................................................... 4 RAID 5 rebuild performance.............................................................................................................. 5 Rebuild rate for different rebuild priority settings .............................................................................. 6 Rebuild rate with no host I/O activity.............................................................................................. 7 Rebuild rate for concurrent host I/O requests ................................................................................... 7 Testing configurations........................................................................................................................... 9 Hardware configuration.................................................................................................................... 9 Software configuration.................................................................................................................... 10 Drive failure emulation process ........................................................................................................ 10 For more information.......................................................................................................................... 11 Call to action .................................................................................................................................... 11
منابع مشابه
Rebuild Strategies for Redundant Disk Arrays
RAID5 performance is critical while rebuild is in progress, since in addition to the increased load to recreate lost data on demand, there is interference caused by rebuild requests. We report on simulation results, which show that processing user requests at a higher, rather than the same priority as rebuild requests, results in a lower response time for user requests, as well as reduced rebui...
متن کاملHierarchical RAID: Design, performance, reliability, and recovery
Hierarchical RAID (HRAID) extends the RAID paradigm to mask the failure of whole Storage Nodes (SNs) or bricks, where each SN is a disk array with a certain RAID level. HRAIDk/l with N SNs and M disks per SN tolerates k SN failures and l disk failures per SN withMaximum Distance Separable (MDS) erasure codes, which introduce the minimum level of redundancy at each level. For N = M there are k i...
متن کاملData allocation in a Heterogeneous Disk Array (HDA) with multiple RAID levels for database applications
We consider the allocation of Virtual Arrays (VAs) in a Heterogeneous Disk Array (HDA). Each VA holds groups of related objects and datasets such as files, relational tables, which has similar performance and availability characteristics. We evaluate single-pass data allocation methods for HDA using a synthetic stream of allocation requests, where each VA is characterized by its RAID level, dis...
متن کاملAlmost complete address translation (ACATS) disk array declustering
We present a novel declustering scheme (ACATS) for reliability stripes in an orthogonal disk array. Our scheme is deterministic, run-time efficient, and provides frequently the best possible and always an almost best possible distribution of failure-induced incremental rebuild workloads. Our scheme provides protection against single disk as well as single string failures within the disk array. ...
متن کاملScalability of RAID systems
RAID systems (Redundant Arrays of Inexpensive Disks) have dominated backend storage systems for more than two decades and have grown continuously in size and complexity. Currently they face unprecedented challenges from data intensive applications such as image processing, transaction processing and data warehousing. As the size of RAID systems increases, designers are faced with both performan...
متن کامل