Rayson Ho wrote:
On 4/12/07, Chen, Robert <[EMAIL PROTECTED]> wrote:
How to dtrace a who is writing a veritas volume?
May be fuser or lsof is faster to provide the answer??
Rayson
Thanks.
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Are you looking for data aggregated on user or process? For veritas
filesystems, the io provider doesn't seem to work terribly well because
veritas will aggregate operations and not be able to report specifically
which process or file is being written/read. However, you can use the
fds[] array and the fileinfo_t structures with syscalls, so you could do
something like
#pragma D option quiet
syscall::*write*:entry
{
@[fds[arg0].fi_mount, pid] = sum(arg2);
}
tick-5sec
{
trunc(@,20);
printf("---------------------------------------------------------------------------------------------\n");
printf("%30s %10s %10s\n", "Mnt Point", "PID", "Sum(Size)");
printa("%30s %10d [EMAIL PROTECTED]", @);
printf("---------------------------------------------------------------------------------------------\n");
trunc(@);
}
This will give you the top 20 mntpt/pid combinations every 5-seconds and
then clear the aggregation. You can create aggregations on individual
files using fi_pathname instead of fi_mount, and you can narrow the
files/mntpts using predicates to the syscall entry.
Put that script in a file and run with dtrace -s <script filename> to
use it.
-Andy
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