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тАО09-06-2010 03:16 AM
тАО09-06-2010 03:16 AM
Recently my server had Panic Shutdown. I called to support center and then they required to send crash file. In few days they determined that i have some problem with OS, such as:
...
3. A big value of memory uses for file system cache. Because i use Oracle DB there and DB uses own cache value.
Tunables
========
filecache_max = 47.6%
filecache_min = 4.8%
fs_meta_max = 46.6%
fs_meta_min = 1.0%
He recommended to turn off or decrease the file system cache value.
So what do you think, should i turn off or decrease this value? And do you know any documents where is the description of this operation. I mean where is the clear description of doing this trip.
Regards,
Rustam
Solved! Go to Solution.
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тАО09-06-2010 03:26 AM
тАО09-06-2010 03:26 AM
Re: The value of OS' file cache
you could read this docu :
"HP-UX Performance Cookbook"
http://h21007.www2.hp.com/portal/download/files/unprot/devresource/Docs/TechPapers/UXPerfCookBook.pdf
mikap
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тАО09-06-2010 05:20 AM
тАО09-06-2010 05:20 AM
Re: The value of OS' file cache
Have a look at the manpages for 'filecache_max(5)' as a guide.
Regards!
...JRF...
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тАО09-07-2010 03:02 AM
тАО09-07-2010 03:02 AM
Re: The value of OS' file cache
I read both material and decided to change this value. First i wanted to check the memory value. I found out strange value on my server. I have 2 servers prod and test, i attached screen of top command.
Prod has:
Memory: 5195184K (1353332K) real, 7307632K (1888260K) virtual, 395860K free Page
e# 1/22
So
-RAM is 8Gb - used 5.2 Gb of them.
-Virtual memory is 1Gb and used 700Mb
Test has:
Memory: 12330140K (3462780K) real, 21361628K (7866040K) virtual, 117708K free Pa
age# 1/32
How many GB are for TEST server is used?
Regards,
Rustam.
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тАО09-07-2010 01:14 PM
тАО09-07-2010 01:14 PM
Re: The value of OS' file cache
Please provide the "swapinfo -tam" values for each machine.
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тАО09-07-2010 08:33 PM
тАО09-07-2010 08:33 PM
Re: The value of OS' file cache
I attached the result of swapinfo tam od prod and test. Test uses 90% of swap memory and prod just 42%. Therefore he suggested to turn off or decrease cache info for FileSystem. What do you think?
Regards,
Rustam.
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тАО09-08-2010 12:53 AM
тАО09-08-2010 12:53 AM
Re: The value of OS' file cache
(It would be more helpful to attach a text file, since I can't grep or diff pixels.)
>Test uses 90% of swap memory and prod just 42%. Therefore he suggested to turn off or decrease cache info for FileSystem. What do you think?
Yes, it makes a lot of sense. Lots more memory is used for caching? in the second case.
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тАО09-08-2010 02:44 AM
тАО09-08-2010 02:44 AM
Re: The value of OS' file cache
For prod
# swapinfo -tam
Mb Mb Mb PCT
TYPE AVAIL USED FREE USED
dev 8192 0 8192 0%
reserve - 7078 -7078
memory 15555 2909 12646 19%
total 23747 9987 13760 42%
For test
# swapinfo -tam
Mb Mb Mb PCT
TYPE AVAIL USED FREE USED
dev 8192 5152 3040 63%
reserve - 3040 -3040
memory 15555 13328 2227 86%
total 23747 21520 2227 91%
>>Yes, it makes a lot of sense. Lots more memory is used for caching? in the second case.
So i have to turn off file cache value?
Regards,
Rustam.
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тАО09-08-2010 11:01 PM
тАО09-08-2010 11:01 PM
Re: The value of OS' file cache
No, just reduce it to a smaller value. Check the value of filecache_max on prod and set test to that value. But if it is 50%, you could just set it to 6% or so.
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тАО09-12-2010 10:15 PM
тАО09-12-2010 10:15 PM
Re: The value of OS' file cache
I checked the value of filecache_max on both server and there are default values - 8155217920. In test is used percentage is 98% and in prod is 16%. How can i check the value of filecache_max in %?
Regards,
Rustam