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тАО05-21-2004 01:35 AM
тАО05-21-2004 01:35 AM
Availability Manager Log File
This is to do with my previous question...
Regards
Peter
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тАО05-21-2004 02:04 AM
тАО05-21-2004 02:04 AM
Re: Availability Manager Log File
WSdef - 2000
WSquo - 4000
WSextent - 16384
Any suggestions on what to set the working sets to??
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тАО05-21-2004 02:48 AM
тАО05-21-2004 02:48 AM
Re: Availability Manager Log File
could it be that your hardware is just a little bit bigger than the system which the AM treshold values are tuned to?
The amount of IO being reported means YOUR system can do, and does do, a lot more work than your reporting tool considers 'normal'.
And I guess you DO have this system to work for you(r company)?
As it is now, just writing this log-file itself is generating significant I/O :-(
Adjust your AM rules so that EXCEPTIONS are reported, but normal-to-your-system conditions are NOT.
_Some_ entries ARE interesting though.
-several signals of 'working set quota is too small'. Seek out those accounts, THOSE are the usernames that would benefit from a WSQUO boost!
You might consider starting with doubling it.
Watch WSEXT as well, you wouldn't want to increase WSQ over WSE!
( and beware, SYSGEN WSMAX sets a hard upper limit, it might need increasing as well, but THEN have AUTOGEN do its recalc on all values).
- several 'SYSTEM high page fault rate'
increase SYSMWCOUNT (start at doubling; we are at 8 * default)
- 'Window turn rate on EURAXP is high'.
Indicative of fragmented files. You CAN however let VMS deal with it (at the cost of memory use) by setting SYSGEN ACP_WINDOW to 255.
This gives cathedral windows to your file headers, ie, irrespective of size the whole header is kept in memory. The parameter IS Dynamic, but changes take only effect for disks mounted AFTER the change!
- several 'paging I/O rate is high'
Seek these out! Those accounts need boosting their PGFLQ (start by doubling)
I DID notice some, but very little, COM state reports. If you did NOT set a treshold to reduce reporting those, than I guess your system can readily handle the load (at least, during this logfile period)
Well, enough work to get started, I think.
Success!
Jan
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тАО05-21-2004 02:55 AM
тАО05-21-2004 02:55 AM
Re: Availability Manager Log File
I know about the io window turn rate and split transfer rate,coming in this weekend to defrag the disks some are 92% fragmented.
Will try the things you have suggested though.
Regards
Peter
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тАО05-21-2004 03:01 AM
тАО05-21-2004 03:01 AM
Re: Availability Manager Log File
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тАО05-21-2004 04:42 AM
тАО05-21-2004 04:42 AM
Re: Availability Manager Log File
Yes, that's what the process names suggest.
I must admit that I failed to take note though :-(
But it _IS_ all the more reason!
These are pooled quota, if you create a subprocess (spawn, lib$spawn, etc) the quota of the spawning process are split, half given to the child, and half kept.
Next spawn leaves/gives only 1/4th, then 1/8th etc!!!
You CAN tweak this a bit by PQL_Mxxx params, because no process ever gets less, but that IS rather crude. (could be a good safetynet though).
Jan
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тАО05-22-2004 05:48 AM
тАО05-22-2004 05:48 AM
Re: Availability Manager Log File
Jan is on the rigth track here.
You'll need to tweak tweak the AMDS rules to tell it that higher direct and buffered IO rates are normal for your box. After all, that is just an indication of work being done. Whether thre are more DIO then needed can only be determined from appliaction (Oracle) data.
Even if amds is rigth and those rates are too high, by increasing the threshholds you will be able to focus on the worst offenders which probably give you better insights quickly.
Now you do NOT want to do this just from reports a week late. You want to run this while the system is active such that you can ask Oracle who is responsibel for certain slaves. You have to query V$SESSIONS and V$PROCESS to correlate the backend (for example ORA_EURPC0927 with a frontend (maybe LPIOLI) to get a clue of what work migth be attempted. You probably also want to (have your dba) query v$sql to get an impression which queries are being executed when DECamds is complaining. Maybe you can find Oracle tablescans that can be addressed or maybe you find OCI connections that can benefit from larger array sizes.
Good Luck,
Hein.