|Summary:||FEAT: [RHEL4 U3] kernel dm: Statistic information about dm devices (*)|
|Product:||Red Hat Enterprise Linux 4||Reporter:||Issue Tracker <tao>|
|Component:||kernel||Assignee:||Alasdair Kergon <agk>|
|Status:||CLOSED ERRATA||QA Contact:|
|Version:||4.0||CC:||jbaron, jnomura, kueda, milan.kerslager, tao, tkincaid|
|Fixed In Version:||RHSA-2006-0132||Doc Type:||Enhancement|
|Doc Text:||Story Points:||---|
|Last Closed:||2006-03-07 19:59:00 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
|Bug Depends On:|
|Bug Blocks:||168429, 173398|
Comment 8 Alasdair Kergon 2005-10-21 13:25:03 UTC
This feature request can be broken down into 4 items: 1) Kernel changes for dm to use the existing kernel I/O stats mechanism; 2) A new kernel dm module to gather sophisticated customised stats; 3) Simple userspace tools changes to make it easy to use (2); 4) Sophisticated userspace tools (and gui) changes to get the best out of (2). I'm going to use this bugzilla to cover 1 and 2 ('kernel' component). Someone might like to raise new ones to cover 3 and 4 (device-mapper / lvm2 / lvm2 GUI components).
Comment 9 Alasdair Kergon 2005-10-21 13:27:34 UTC
The patch for (1) is simple - needs a review, but certainly feasible for U3. The patch for (2) also exists but is more complex - not reviewed properly yet, API needs more work, but might be possible to include it in some form in U3 if there's time.
Comment 12 Alasdair Kergon 2005-11-16 16:29:10 UTC
*** Bug 143390 has been marked as a duplicate of this bug. ***
Comment 17 Alasdair Kergon 2005-11-18 15:40:29 UTC
*** Bug 170693 has been marked as a duplicate of this bug. ***
Comment 18 Jun'ichi Nomura (Red Hat) 2005-11-18 19:44:02 UTC
Created attachment 121243 [details] test cases for dm diskstat Test cases for dm diskstat. To complete this test, timing information collected by BZ#173398 is also needed. - Criteria for read_ticks, write_ticks, io_ticks may be too strict and sometimes cause false negative. Needs several trials to avoid it. - There may be better/finer criterion for time_in_queue.
Comment 27 Red Hat Bugzilla 2006-03-07 19:59:00 UTC
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2006-0132.html