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тАО06-05-2001 11:37 AM
тАО06-05-2001 11:37 AM
more Physical I/Os than Logical I/Os
I notice on my systems I have more physical I/Os than logical I/Os and the system is running slow.
V2250, 16 GB ram and vxfs filesystems with ORacle database.
Any thoughts Why???
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тАО06-05-2001 11:50 AM
тАО06-05-2001 11:50 AM
Re: more Physical I/Os than Logical I/Os
and thus logical i/o's can be less than physical i/o's.
I suspect that you also need to reduce max_dbc_pct as well or set bufpages to about 300-400 MB and thus override dynamic buffer cache. You could then probably increase your ORACLE buffers.
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тАО06-05-2001 12:03 PM
тАО06-05-2001 12:03 PM
Re: more Physical I/Os than Logical I/Os
Oracle needs to be tuned , to reduce the physical reads and ther should be more logical reads.
1.dbc_max to dbc_min difference should be arounf 800mb to 1 gb.
2.Do a sarcheck , go to www.sarcheck.com and downlaod ttheir utility , it take 5 mts to set it up and it give really wonderful results
3. Also I think your real problem is the differnce between what block size oracle is set to and what size your filesystem is set to , incase it is like 16K for oracle and 4 K for Unix then ofcourse you have a problem because for the maintenace oracle works on the block level .
Manoj Srivastava
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тАО06-07-2001 11:49 AM
тАО06-07-2001 11:49 AM
Re: more Physical I/Os than Logical I/Os
Kanda
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тАО06-07-2001 11:52 AM
тАО06-07-2001 11:52 AM
Re: more Physical I/Os than Logical I/Os
Yes Sir , it would involve to recreate the filesystems which is a big pain , unless you are not into production.
Manoj Srivastava
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тАО06-07-2001 12:16 PM
тАО06-07-2001 12:16 PM
Re: more Physical I/Os than Logical I/Os
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тАО06-07-2001 12:41 PM
тАО06-07-2001 12:41 PM
Re: more Physical I/Os than Logical I/Os
No the 64KB stripe for your logical volumes will not effect the physical read to logical read ration since that goes across a bigger picture , physical disks , contorllers etc .
Manoj Srivastava