Optimization for RAID-5 small-write performance using disk-based XOR engine

Yu'an Tan; Wanxing Wang; Qiang Yu; Ligu Zhu; Xuelan Zhang

Optimization for RAID-5 small-write performance using disk-based XOR engine

Yu'an Tan^*, Wanxing Wang, Qiang Yu, Ligu Zhu, Xuelan Zhang

^*Corresponding author for this work

School of Cyberspace Science and Technology

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The SCSI commands (XDWRTTE, XDREAD and XPWRITE) are already on fibre channel drives to involve the drives participating in performing RAID 5 XOR functions. For 'small writes', traditional RAID-5 implementation requires a host or a RAID controller to read the original parity block, then construct the new parity block by computing the exclusive-or (XOR) of the original parity block and data blocks, the new SCSI commands have been adopted to implement the 'small writes' without reading the parity block, and cause the drive to construct and update the parity block itself. By utilizing the disk's XOR engine, the throughput is increased and the average latency is also reduced.

Original language	English
Pages (from-to)	237-239
Number of pages	3
Journal	Jisuanji Gongcheng/Computer Engineering
Volume	32
Issue number	16
Publication status	Published - 20 Aug 2006

Keywords

Disk array
Exclusive-or engine
RAID
Small write

Cite this

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abstract = "The SCSI commands (XDWRTTE, XDREAD and XPWRITE) are already on fibre channel drives to involve the drives participating in performing RAID 5 XOR functions. For 'small writes', traditional RAID-5 implementation requires a host or a RAID controller to read the original parity block, then construct the new parity block by computing the exclusive-or (XOR) of the original parity block and data blocks, the new SCSI commands have been adopted to implement the 'small writes' without reading the parity block, and cause the drive to construct and update the parity block itself. By utilizing the disk's XOR engine, the throughput is increased and the average latency is also reduced.",

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AU - Zhu, Ligu

AU - Zhang, Xuelan

PY - 2006/8/20

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N2 - The SCSI commands (XDWRTTE, XDREAD and XPWRITE) are already on fibre channel drives to involve the drives participating in performing RAID 5 XOR functions. For 'small writes', traditional RAID-5 implementation requires a host or a RAID controller to read the original parity block, then construct the new parity block by computing the exclusive-or (XOR) of the original parity block and data blocks, the new SCSI commands have been adopted to implement the 'small writes' without reading the parity block, and cause the drive to construct and update the parity block itself. By utilizing the disk's XOR engine, the throughput is increased and the average latency is also reduced.

AB - The SCSI commands (XDWRTTE, XDREAD and XPWRITE) are already on fibre channel drives to involve the drives participating in performing RAID 5 XOR functions. For 'small writes', traditional RAID-5 implementation requires a host or a RAID controller to read the original parity block, then construct the new parity block by computing the exclusive-or (XOR) of the original parity block and data blocks, the new SCSI commands have been adopted to implement the 'small writes' without reading the parity block, and cause the drive to construct and update the parity block itself. By utilizing the disk's XOR engine, the throughput is increased and the average latency is also reduced.

KW - Disk array

KW - Exclusive-or engine

KW - RAID

KW - Small write

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Optimization for RAID-5 small-write performance using disk-based XOR engine

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Keywords

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