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 vxtrace(1M)			  VxVM 3.5			 vxtrace(1M)
				 1 Jun 2002



 NAME
      vxtrace - trace operations on volumes

 SYNOPSIS
      vxtrace [-aeEls ] [-b buffersize] [-c eventcount]
	     [-d outputfile] [-f inputfile] [-g diskgroup]
	     [-k buffersize] [-m millisec_delay]
	     [-o objtype [,objtype]...] [-t timeout]
	     [-w waitinterval] [name | device]...

 DESCRIPTION
      The vxtrace utility prints kernel error or I/O trace event records on
      the standard output or writes them to a file in binary format.  Binary
      trace records written to a file can be read back and formatted by
      vxtrace as well.

      If no arguments are specified, vxtrace reports either all error trace
      data or all I/O trace data on all virtual disk devices.  With error
      trace data, it is possible to select all accumulated error trace data,
      to wait for new error trace data, or both (the default).	Selection
      can be limited to a specific disk group, to specific types of VERITAS
      Volume Manager (VxVM) kernel I/O objects, or to particular named
      objects or devices.

      Under heavy loads, the kernel may discard one or more records before
      they can be reported to vxtrace.	Even though the contents of the
      records are lost, the kernel keeps track of the number of lost records
      and reports this to vxtrace.  as a record.  vxtrace displays this
      record indicating that records were lost.	 You can increase the size
      of the kernel buffer using the -k buffersize option to reduce the
      likelihood of the kernel discarding records.

 OPTIONS
      -a	Appends to the outputfile instead of truncating it.  By
		default, the output file is truncated.

      -b buffersize
		Sets the size of the buffer used by vxtrace when it obtains
		trace records from the kernel, or from a file when the -f
		option is specified.  The buffer size is specified as a
		standard VERITAS Volume Manager length (see vxintro(1M)).
		The default buffer size is 8K.

      -c eventcount
		Accumulates at most eventcount events and then exits.  The
		timeout and eventcount options can be used together.

      -d outputfile
		Writes (dumps) binary trace data to the specified output
		file.




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 vxtrace(1M)			  VxVM 3.5			 vxtrace(1M)
				 1 Jun 2002



      -e	Selects new error trace data.  The default is to select I/O
		trace data.

      -E	Selects pre-existing error trace data.	This can be combined
		with -e to get both pre-existing trace data and new trace
		data.

      -f inputfile
		Reads binary trace data from the specified input file,
		instead of from the VERITAS Volume Manager kernel.

      -g diskgroup
		Selects objects from the specified disk group.	The disk
		group can be specified either by disk group ID or by disk
		group name.  With no name or device arguments, all
		appropriate objects in the disk group are selected.  With
		the name argument, diskgroup specifies the disk group that
		contains the named configuration record.

      -k buffersize
		Sets the kernel I/O trace buffer size.	The VERITAS Volume
		Manager kernel allocates a private kernel space to buffer
		the I/O trace records for each vxtrace command.	 The default
		buffer size is 8K bytes.  Some trace records may be
		discarded if the trace buffer is too small.  This option can
		be used to set a larger or a smaller kernel trace buffer
		size.  The buffer size is specified as a standard VERITAS
		Volume Manager length (see vxintro(1M)).  Depending on the
		VERITAS Volume Manager kernel configuration, usually only a
		maximum buffer size of 1 megabyte is granted.

      -l	Long format.  Prints all available fields for all tracing
		records, instead of a subset of the available fields.  The
		default is to use the short format.

      -m millisec_delay
		Pauses vxtrace for the specified period to allow more
		records to accumulate.

      name | device
		If name or device are specified, VERITAS Volume Manager
		kernel objects of the requested types are selected if they
		are associated with the configuration records or virtual
		disk devices indicated by those arguments.

      -o objtype [,objtype]...
		Selects object based on the objtype option arguments.
		Multiple types of objects can be specified with one or
		several -o options.  The possible object selection types
		are:




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 vxtrace(1M)			  VxVM 3.5			 vxtrace(1M)
				 1 Jun 2002



		all | ALL Selects all possible virtual disk devices, kernel
			  objects, and physical disks.

		dev | logical
			  Selects virtual disk devices.

		disk | physical
			  Selects VERITAS Volume Manager physical disks.

		log	  Selects all log objects.

		logplex	  Selects RAID-5 log plexes.

		logsd	  Selects DRL (dirty region logging) or RAID-5 log
			  subdisks.

		logvol	  Selects DRL or RAID-5 log volumes.

		m | mv | mirror
			  Selects mirrored volume kernel objects.

		p | pl | plex
			  Selects striped or concatenated plex kernel
			  objects.

		rl | rlink
			  Selects RLINK kernel objects.	 If an RVG
			  (replicated volume group) is specified, all RLINKs
			  associated with that RVG are selected.

		s | sd | subdisk
			  Selects subdisk kernel objects.

		v | vol | volume
			  Selects mirrored or RAID-5 volume kernel objects.

      -s	Specifies using synchronous writes to the outputfile instead
		of asynchronous writes.	 Asynchronous writes is the default.

      -t timeout
		Accumulates trace data for at most timeout seconds, then
		exits.

      -w waitinterval
		If vxtrace waits for waitinterval seconds without receiving
		any new events, prints waiting...  to allow scripts to wake
		up and process previously accumulated events.  This is
		useful for processing errors.  The waiting...  message does
		not count as an event for the purposes of the -c option.





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 vxtrace(1M)			  VxVM 3.5			 vxtrace(1M)
				 1 Jun 2002



 ARGUMENTS
      Arguments specify configuration record names, or physical or virtual
      disk device nodes (by device path).  If no object types were selected
      with the -o option, only trace records corresponding to the indicated
      configuration records or devices are selected; otherwise, objects of
      the requested types are selected if they are associated in any way
      with the named configuration record or device.

      If a name argument does not match a regular configuration record, but
      does match a disk access record, the indicated physical disk is
      selected.	 Physical disks can also be selected by the disk media
      record name.

      By default, name arguments are searched for in all disk groups or in
      the disk group specified using the -g option.  Without the -g option,
      a record that is found in more than one disk group generates an error
      unless the record is in the rootdg disk group (in which case, the
      record in the rootdg disk group is selected).  The disk group for any
      individual name argument can be overridden using the form:

	   diskgroup/recordname


      Note: When reading trace data from a file with the -f option,
      association information is not available.

 EXAMPLES
      To trace all physical disk I/Os, enter:

	   vxtrace -o disk


      To trace virtual disk device I/Os to the device associated with volume
      testvol, use either of the commands:

	   vxtrace -o dev testvol
	   vxtrace /dev/vx/dsk/testvol


      To trace all log subdisks associated with volume testvol, enter:

	   vxtrace -o logsd testvol


      To trace all log objects, enter:

	   vxtrace -o log


      To accumulate ten seconds worth of trace data for disk04 and then
      format that data, use:



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 vxtrace(1M)			  VxVM 3.5			 vxtrace(1M)
				 1 Jun 2002



	   vxtrace -t 10 -d /tmp/tracedata disk04
	   vxtrace -l -f /tmp/tracedata


      To read error trace data into a script for processing, using ten
      second pauses to generate mail messages, use the command:

	   vxtrace -leE -w 10 | while read ...


 FILES
      /dev/vx/trace

 SEE ALSO
      vxintro(1M), vxstat(1M), vxtrace(7)







































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