Provided by: scsitools_0.8-2_i386 bug

NAME

       sraw - benchmark raw scsi I/O performance under linux

SYNOPSIS

       sraw scsi-device [ bstart [ bstep ] ]

DESCRIPTION

       This  program  was  written  because  of all of the whining on the SCSI
       channel about poor performance  of  the  scsi  drivers.   This  program
       basically  reads the specified scsi device and measures the throughput.
       Note that the filesystem *AND* the buffer cache are  bypassed  by  this
       code,  this program was designed to benchmark the naked scsi drivers by
       themselves without the need to account for the overhead  of  any  other
       portion of the kernel.

       This  program  does a series of reads of the disk, of consecutive areas
       on the disk.  The device is first queried to determine the sector  size
       for the device, and then the series of reads is begun.  About 5.0 Mb is
       read from the device, and then the performance  numbers  are  reported.
       Note  that  since  the buffer cache is completely bypassed, there is no
       need to be concerned about cache hits or anything.

       Output of sraw is a set  of  lines,  4  numbers  per  line:  blocksize,
       elapsed time, nblocks and throughput (in bytes per second).

OPTIONS

       bstart starting block to check different zones on ZBR discs

       bstep  factor  for  sequential  stepping, default 1.  Use 0 for reading
              always the same blocks (from cache)

AUTHOR

       sraw was written by Eric Youngdale.

AVAILABILITY

       sraw is available at
       ftp://tsx-11.mit.edu/pub/linux/ALPHA/scsi/

                                   Nov 1993                            SRAW(8)