NDLI: Performance measurements of the first raid prototype

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Performance measurements of the first raid prototype

Content Provider	NASA Technical Reports Server (NTRS)
Author	Chervenak, Ann L.
Copyright Year	1990
Description	The performance is examined of Redundant Arrays of Inexpensive Disks (RAID) the First, a prototype disk array. A hierarchy of bottlenecks was discovered in the system that limit overall performance. The most serious is the memory system contention on the Sun 4/280 host CPU, which limits array bandwidth to 2.3 MBytes/sec. The array performs more successfully on small random operations, achieving nearly 300 I/Os per second before the Sun 4/280 becomes CPU limited. Other bottlenecks in the system are the VME backplane, bandwidth on the disk controller, and overheads associated with the SCSI protocol. All are examined in detail. The main conclusion is that to achieve the potential bandwidth of arrays, more powerful CPU's alone will not suffice. Just as important are adequate host memory bandwidth and support for high bandwidth on disk controllers. Current disk controllers are more often designed to achieve large numbers of small random operations, rather than high bandwidth. Operating systems also need to change to support high bandwidth from disk arrays. In particular, they should transfer data in larger blocks, and should support asynchronous I/O to improve sequential write performance.
File Size	2755328
Page Count	62
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19910010405
Archival Resource Key	ark:/13960/t7np6zw5f
Language	English
Publisher Date	1990-05-17
Access Restriction	Open
Subject Keyword	Computer Operations And Hardware Controllers Protocol Computers Hierarchies Computer Systems Performance Bandwidth Central Processing Units Architecture Computers Magnetic Disks Memory Computers Operating Systems Computers Input/output Routines Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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