[Orca-users] RE: Problem with Multiple Disk Run Percent Graphs sh owing and a quest ion

[O'Neill, Sean]

K ... I didn't read the comments at the top of orcallator.se v1.28b4.
Apparently giving statisitcs for md devices has been removed and that's why
the headers aren't showing up anymore.
 
But why is ORCA, or RRD in this case, still generating graphs with MD device
names ?
 
I brought this up because of an idea I have of ORCA showing information
related to RAID strip performance.  In the "Capacity Planning for Internet
Servers" book there is a little section on deriving performance statistics
for strip configurations on page 114.  I think this would be something VERY
interesting to have data on and I think ORCA could be tweaked to handle it.
Of couse, before this can happen the stability of the disk section within
ORCA needs to be ironed out.

-----Original Message-----
From: O'Neill, Sean 
Sent: Friday, July 20, 2001 11:10 AM
To: 'orca-users at yahoogroups.com'
Subject: [orca-users] Problem with Multiple Disk Run Percent Graphs showing
and a quest ion


First, I'm running the most current ORCA/RRD configuration available with SE
v3.2 on Solaris 8 system.

Long email but please read ... this is REALLY getting frustrating.

I'm asking this question hoping to get rid of these annoying multiple and
usually incorrect Disk Run Percent graphs.  I've noticed the following which
looking into this:

- I'm using SDS on my system and for a long while the MD devices were being
graphed.  I stopped ORCA for a while doing something and restarted it a
while later.  The MD devices weren't showing up anymore in the graphs.  Only
the cXtXdX devices were.

- At midnight, the data files rolled over and the multiple Run Percent
graphs showed up.  This time the MD devices DID show up in one of the graphs
but the data is wrong.

So I started poking around.

- When ORCA restarts it apparently puts a new "header" line in the
orca/orcallator/<hostname>/percol-<date> file.  By header I mean:

timestamp locltime DNnsrkcmdit   uptime  usr%  sys%  wio% idle%  1runq ....
<and lots more>

It also does this when it rolls over to the next day at midnight and creates
a new data file.

- I noticed that in the file for today that was created last night the MD
devices are NOT showing at all in the headers.  Only the cXtXdX devices are.

- I saw that the "headers" are mirrored in the
orca/rrd/orcallator/<hostname>/orca.state file used by RRD.  Same problem
entries.  I noticed that most entires look this this:

/usr/local/orca/var/orca/orcallator/chivas/percol-2001-06-22.bz2 993272102
995577819 8388687 80022 25799 993272102
USETHISFILE/usr/local/orca/var/orca/orcallator/chivas/percol-2001-06-21.bz2

which I think means use the "headers" (USETHISFILE) found for this entry.

So I'm pretty sure the problem isn't with RRD and the graphs.  Its the data
being fed to RRD.

The last time the MD devices were showing up in the data correctly was in
the percol-2001-07-18 data file.  I had stopped and restarted ORCA on the
19th for something and that's when this problem came up.  I tried "fixing"
this by deleting the percol-2001-07-19 data file completely.  ORCA recreated
the percol-2001-07-19 data file Did this but the problem was still.  Only in
this fashion:

- The percol-2001-07-19 and percol-2001-07-20 data files have NO references
to MD devices anywhere in the headers yet a graph (one of several) is being
generated with MD name references in it even though the data is crap.

So why isn't ORCA picking up my MD devices anymore ?  I assume this issue
isn't specific to MD devices.  This is probably happening for the other
devices as well.  

I tried deleting the percol-2001-07-20 data file as well as the entry for
2001-07-20 from the orca.state file.  My MD devices still were not picked
up.

Any ideas out there ??

..................................................
....... ..- -. .. -..- .-. ..- .-.. . ... ........
.-- .. -. -.. --- .-- ... -.. .-. --- --- .-.. ...

Sean O'Neill
Senior UNIX Systems Engineer / Project Leader
Global Services
Commerce One

1100 West Street
Laurel, MD 20707
301 939 1213 voice mail
301 953 2368 fax
301 526 1514 cell
sean.oneill at commerceone.com
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