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тАО03-26-2003 10:44 PM
тАО03-26-2003 10:44 PM
Disk utilization
We are running an application on HP-UX L3000 server. The disk layout is explained below.
Three 36.4GB hardidsks.
First disk used for the oracle indexes and root partition (18.2 GB each)
Second disk is used for oracle tables and Application logs. (18.2 GB each)
Third disk is used for Oracle logs (18.2 GB) and remaining 18.2 GB is free in the third disk.
On the second disk almost the disk IO rate is 100% always, is anybody have any idea why this is always 100% do we have to tune any kernal parameters.
Presently we are trying to test with following options
1. Moving the Application logs from second disk to 3 disk. (i.e. in third disk we have 18.2 GB free space, we are planning to create another lvol in the volume group of third disk and move all the logs from disk 2 lvol to newly created lvol)
2. Adding separate disk for application logs and moving all the logs data from second disk to new disk.
Is any options mentioned above will solve the disk I/O problem? or is there any body have any ideas please..
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тАО03-26-2003 10:53 PM
тАО03-26-2003 10:53 PM
Re: Disk utilization
The Disk is going 100% as the Oracle processes go on writing with the logfiles and the datafiles.
Distribution the datafiles and logfiles should improve the situation.
I do not think any kernel parameter can help you on this.
If you have Glance then you can get a clear picture on the process which has a high I/O rate on the disk.
Thanks
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тАО03-26-2003 10:56 PM
тАО03-26-2003 10:56 PM
Re: Disk utilization
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тАО03-28-2003 12:02 AM
тАО03-28-2003 12:02 AM
Re: Disk utilization
George
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тАО03-28-2003 07:24 AM
тАО03-28-2003 07:24 AM
Re: Disk utilization
Having said all that, if you can not get additional disks for this system and keep everything in 1 volume group, I would use Ignite and rebuild the system. Create a make_tape_recovery tape and rebuild from that striping all of your logical volumes across the 3 disks.
In an Oracle environment it can be difficult to pinpoint where the majority of your activity will be. If it is for the most part static data and mostly reads happening, there will not be much activity in your logs. So putting the logs on a seperate disk means that disk will not be busy but, your data disk(s) may be overworked.
If a lot of data is being added and or deleted, the data and log volumes will be active.
If you have inadequate memory you may be swapping so the swap devices can be very active.
With only 3 disks I would stripe across all of them and hope it all balances out somewhat. More disks is really the answer.
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тАО03-29-2003 08:18 AM
тАО03-29-2003 08:18 AM
Re: Disk utilization
for this issue ,if you have free memory u can change some kernel parmeter to increase the i/o performance
nbuff 5
dbcmax 25
dbcmin 5
this will give some performanc enchanment ,as it copies more data to memory ,so it doesnt aceess disk quite frequently
Rizwan
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тАО03-29-2003 05:11 PM
тАО03-29-2003 05:11 PM
Re: Disk utilization
Striping might help a bit but you just don't have enough disks to make much of a difference.
Bill Hassell, sysadmin
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тАО03-30-2003 08:09 PM
тАО03-30-2003 08:09 PM
Re: Disk utilization
Though it can help you out in your currenet situation, you'll get better performance using Raid 1/0 mirroring.
lvextend -m 1 /dev/vg01/oradata /dev/dsk/c#t#d#
The archive logs and such don't benefit as much from this setup.
Striping will improve reliability, especially if you strip across more disks, but there is a disk performance penalty.
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