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10-27-2011 06:21 PM
10-27-2011 06:21 PM
Physical_ii_buffers kernel parameter setting
Help please
do you set this parameter in
B.11.23/ U 9000/800
what doe the auto mean ?
We have 2 system set up the same 1 processor 4 gig memory each. san disk used.
on 1 system db job takes 46 minutes and on the other it takes 2h 28 min.
THe only difference I can see is in the kernel parameters
on fast system
set at physical_io_buffers 1280 Default Auto
on slow systemphysical_io_buffers 1024 Default Auto
sar shows high %wio on slow system
I have no idea of san specs. The systems are using different sans
would physical_io_buffers make much difference
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10-28-2011 03:53 AM
10-28-2011 03:53 AM
Re: Physical_ii_buffers kernel parameter setting
>much difference?
No
>what does the auto mean?
# kctune -v physical_io_buffers Tunable physical_io_buffers Description Number of buffers (512 bytes each) for physical I/O operations Module vm Current Value 768 [Default] Value at Next Boot 0 [Default] Value at Last Boot 768 Default Value 768 Constraints physical_io_buffers == 0 or physical_io_buffers >= 384 physical_io_buffers <= 65535 Can Change Automatic Tuning Enabled
>The systems are using different sans
Here you go ...
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10-31-2011 02:51 PM
10-31-2011 02:51 PM
Re: Physical_ii_buffers kernel parameter setting
There is a big difference
on fast system db update takes 46 mins slow system 2h .26 mins
on fast system db restore takes 2 hours on slow system it takes 7H 32 mins - restore is from disk
The databases are the same size db configuration are the same . DB is informix
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10-31-2011 11:50 PM
10-31-2011 11:50 PM
Re: Physical_ii_buffers kernel parameter setting
Still the same ... check the SAN ...
If
- Hardware is the same
- Software is the same
- Configuration is the same
then
- the SAN is the point to check.
Especially if you say the systems use different SANs and you don't know anything about it.
Changing the kernel parameter will not fix this.