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Full Discussion: How to figure out and solve slow disks?
Operating Systems Solaris How to figure out and solve slow disks? Post 302533297 by DukeNuke2 on Thursday 23rd of June 2011 08:48:29 AM
Old 06-23-2011
dtrace might be good to find what you're watchin for:

Code:
# Files opened by process,
dtrace -n 'syscall::open*:entry { printf("%s %s",execname,copyinstr(arg0)); }'
 
# Read bytes by process,
dtrace -n 'sysinfo:::readch { @bytes[execname] = sum(arg0); }'
 
# Write bytes by process,
dtrace -n 'sysinfo:::writech { @bytes[execname] = sum(arg0); }'
 
# Read size distribution by process,
dtrace -n 'sysinfo:::readch { @dist[execname] = quantize(arg0); }'
 
# Write size distribution by process,
dtrace -n 'sysinfo:::writech { @dist[execname] = quantize(arg0); }'
 
# Disk size by process,
dtrace -n 'io:::start { printf("%d %s %d",pid,execname,args[0]->b_bcount); }'

 

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LEARN ABOUT OSX

lastwords

lastwords(1m)							   USER COMMANDS						     lastwords(1m)

NAME

       lastwords - print syscalls before exit. Uses DTrace.

SYNOPSIS

       lastwords command

DESCRIPTION

       This  prints  the  last few system calls for processes matching the given name, when they exit. This makes use of a ring buffer so that the
       impact on the system is minimised.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       Catch last few syscalls for dying netscape processes,
	      # lastwords netscape

FIELDS

       TIME   time of syscall return, ns

       PID    process ID

       EXEC   process name (execname)

       SYSCALL
	      system call

       RETURN return value for the system call

       ERR    errno for the system call

BASED ON

       /usr/demo/dtrace/ring.d

DOCUMENTATION

       DTrace Guide "Buffers and Buffering" chapter (docs.sun.com)

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       lastwords will sample until a command with that name exits.

SEE ALSO

       dtruss(1M), dtrace(1M)

version 0.70							   Jun 08, 2005 						     lastwords(1m)
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