National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Building a High Performance Raw Disk Subsystem for Alpha/Linux.

DE200415006845

Publication Date	2001
Personal Author	Garlick, J.
Page Count	22
Abstract	The Linux kernel version 2.2.19 lacks UNIX-style raw disk support, and its SCSI layer is optimized for small transfer sizes. This report describes kernel patches to add raw disk support and enhance performance in the SCSI layer and QLA2x00 Fibre Channel device driver for large transfer sizes. Benchmarks demonstrate raw disk performance of 191 megabytes/second write, 176 megabytes/second read for one megabyte random I/O on a Compaq ES40 computer system with two QLogic QLA2200F Fibre Channel host bus adapters, each connected to two Ciprico RF7010 arrays on arbitrated loop.
Keywords	Operating systems(Computers) Disks Performance Kernels Benchmarks Adapters Computer networks Parallel processors
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200416

Building a High Performance Raw Disk Subsystem for Alpha/Linux.

Building a High Performance Raw Disk Subsystem for Alpha/Linux.
DE200415006845

Publication Date	2001
Personal Author	Garlick, J.
Page Count	22
Abstract	The Linux kernel version 2.2.19 lacks UNIX-style raw disk support, and its SCSI layer is optimized for small transfer sizes. This report describes kernel patches to add raw disk support and enhance performance in the SCSI layer and QLA2x00 Fibre Channel device driver for large transfer sizes. Benchmarks demonstrate raw disk performance of 191 megabytes/second write, 176 megabytes/second read for one megabyte random I/O on a Compaq ES40 computer system with two QLogic QLA2200F Fibre Channel host bus adapters, each connected to two Ciprico RF7010 arrays on arbitrated loop.
Keywords	Operating systems(Computers) Disks Performance Kernels Benchmarks Adapters Computer networks Parallel processors
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200416