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Add back more dire warning to pt-ioprofile.

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Daniel Nichter
2013-03-09 10:37:54 -07:00
parent e1e7bf96c7
commit 40259e5d5b
2 changed files with 15 additions and 4 deletions
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17
bin/pt-ioprofile
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@@ -916,9 +916,9 @@ the result. If you specify a FILE, then step 1) is not performed.
=head1 RISKS
Percona Toolkit is mature, proven in the real world, and well tested,
but all database tools can pose a risk to the system and the database
server. Before using this tool, please:
B<WARNING>: pt-ioprofile freezes the server and may crash the process, or
make it perform badly after detaching, or leave it in a sleeping state!
Before using this tool, please:
=over
@@ -930,6 +930,9 @@ server. Before using this tool, please:
=item * Backup your production server and verify the backups
pt-ioprofile should be considered an intrusive tool, and should not be used
on production servers unless you understand and accept the risks.
=back
=head1 DESCRIPTION
@@ -945,6 +948,14 @@ process for 30 seconds. The output is like:
You probably need to run this tool as root.
pt-ioprofile works by attaching C<strace> to the process using C<ptrace()>,
which will make it run very slowly until C<strace> detaches. In addition to
freezing the server, there is some risk of the process crashing or performing
badly after C<strace> detaches from it, or of C<strace> not detaching cleanly
and leaving the process in a sleeping state. As a result, this should be
considered an intrusive tool, and should not be used on production servers
unless you are comfortable with that.
=head1 OPTIONS
=over