2010-05-26 01:45 PM
I have some customer views setup in PA that have a View Sample Rate of 60 seconds. When I look at this with "dfm perf view retrieve", I usually see a data point every minute. However, I often see data points that are 2 to 3, or even 10, minutes apart.
Is this because DFM was too busy to go out and ask the storage systems for performance data every minute? Or are the storage systems not responding to DFM? Other reasons?
Basically, I'm looking to understand the circumstances under which PA will not gather data at the designated View Sample Rate, so that I can avoid these circumstances and get the performance data gathered as desired the vast majority of the time.
2010-05-26 10:34 PM
I haven't encountered such a scenario. Can you share the following details?
1. What is the object count of the customers? (dfm about would help)
2. What is the DFM version (Since you are using "dfm perf view
retrieve", I assume it to be earlier than DFM 4.0)
3. Are instances being added/deleted frequently in these setups? (When
instances change, the underlying files are re-written)
4. Has the customer configured a schedule for database backup? (When a
backup is being created, performance advisor is disabled)
5. Are you sure there are no intermittent communication issues with the
2010-05-26 10:34 PM
Some more questions:
1. Are the sampling intervals and retention periods being modified in
the setup frequently?
2. Do you see this issue only for the custom views you created or
happens even for the canned views?
2010-05-27 08:34 AM
We are running DFM 3.8...here is the dfm about output:
Version 3.8 (3.8)
Serial Number 1-50-001913
Administrator Name netapp
Host Name nerstrand
Host IP Address 126.96.36.199
Host Full Name nerstrand.int.westgroup.net
Operations Manager Node limit 125 (currently managing 81)
Provisioning Manager Node Limit 30 (currently managing 29)
Operating System SUSE Linux Enterprise Server 10
(x86_64) 188.8.131.52-0.21-smp x86_64
CPU Count 4
System Memory 7920 MB (load excluding cached memory:
Installation Directory /dfm/dfminst
38.6 GB free (15.7%)
Perf Data Directory /dfm/dfminst/perfdata
Data Export Directory /dfm/dfminst/dataExport
Database Backup Directory /dfm/dfminst/data/backup
Reports Archival Directory /dfm/dfminst/reports
Licensed Features Operations Manager: installed
Business Continuance Option: installed
Provisioning Manager: installed
Instances are added to these views at most once per day, and typically
less frequently than that.
Database backups are being run. We see no performance data during the
database backup, as we disable PA as part of this process, so that is
expected. I'm inquiring about periods of time outside of the database
I'm not aware of any communication issues with the storage
systems...would DFM log that somewhere if there were?
2010-05-27 08:59 AM
We are never modifying the sampling intervals or the retention periods
in these views. We see missing data points on the default views as well
as the custom views.
2010-05-31 03:09 AM
If an incorrect password is set on a filer, messages similar to the
following will be logged in dfmserver.log file:
calls to harish1 are failing due to incorrect credentials (using address
10.72.138.47 and username root). Check the hostLogin and hostPassword
2010-06-01 08:24 AM
Yes, but if we had an incorrect password, we would never get any
performance data, right? We are getting performance data, just not
always at the right sampling interval.