dvt(1)

NAME
     dvt - sequentially write and read a file.

SYNOPSIS
     dvt  [-c  block_count]  [-C]  [-d]  [-e   error_limit]   [-g
     stripe_group]   [-o   rw|w|r]   [-O  byte_offset]  [-p]  [-P
     a|f|o|0(zero)]  [-q  queue_size]   [-R   read_threads]   [-s
     block_size] [-v] [-W write_threads] filename

AVAILABILITY
     SUNWsamtp

DESCRIPTION
     dvt writes to a disk file and then reads the disk file.  The
     time  required for the transfer(s) is measured, and the read
     and write transfer rates are computed.  The read  optionally
     verifies the written data.

OPTIONS
     -c  block_count
          The number of blocks to be written/read.

     -C   Specifies that I/O should be buffered through the  page
          cache.

     -d   Specifies direct I/O:  I/O  should  not  use  the  page
          cache.

     -e  error_limit
          Specifies  the  maximum  number  of  data   miscompares
          allowed to occur before the test is stopped.

     -g  stripe_group
          Specifies the number of the  striped  group  where  the
          file  is  to be preallocated.  Stripe_group is a number
          0..127 corresponding to a set of gXXX  devices  in  the
          SAM-QFS master configuration file.  This option applies
          only to filesystems configured with stripe groups.

     -i  stride
          Set the I/O offset stride to stride.

     -o  rw|w|r
          The option rw means write the file and  then  read  the
          file.   This  is the default.  The option w means write
          the file.  The option r means  read  an  existing  file
          written by dvt.

     -O  byte_offset
          Offset initial file I/O by byte_offset bytes.

     -p   Specifies the file should be preallocated.  This option

          applies only to SAM-QFS filesystems.

     -P  a|f|o|0
          The data pattern.  a is an ascending pattern which uses
          the 64 bit byte offset as the pattern.  f is an ascend-
          ing pattern which uses the 64 bit byte  offset  as  the
          pattern,  plus inserts 16 characters of the filename at
          8K boundaries.  o writes all 1's.  0 (the numeral zero)
          writes all 0's.

     -q  queue_size
          Specifies the number of the entries that will  be  out-
          standing  in  the work queue.  The queue_size should be
          larger than read_threads.

     -R  read_threads
          Specifies the number of the threads that will  be  out-
          standing  for  read.   If  read_threads  is  less  than
          write_threads, write_threads will be used.

     -s  size
          The block size in bytes.  If the size has the suffix k,
          the block size is in units of kilobytes.  The size must
          be at least 1064 bytes  to  hold  the  parameter  block
          header.

     -v   Data will be verified on the read pass.  The times  and
          transfer rates will include this comparison time.

     -W  write_threads
          Specifies the number of the threads that will  be  out-
          standing for write.

SEE ALSO
     pdvt(1)

     sam_advise(3), sam_setfa(3)

     mcf(4)