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тАО07-06-2000 05:52 AM
тАО07-06-2000 05:52 AM
HP AutoRAID 12H performance
Using arraydsp -r a get the message:
Add another disk because the disks are being overworked.
I/Os are stacking up in the command queues for the disks. This creates a
bottleneck which can be solved by adding another disk. The new disk will
take some of the workload off the existing disks and improve performance.
When using arraydsp -r I get similar results:
Vendor ID = HP
Product ID = C5447A
Array serial number = 00000013C8F1
Performance Metrics
--------------------------------------------------------------------------------
Requested Period = 09:00 07/06/2000 to 12:00 07/06/2000
Actual Period = 09:15 07/06/2000 to 12:00 07/06/2000
Interval = 4
Out-of-Spec Indicator = *
--------------------------------------------------------------------------------
Drive Relocate Working Cache SCSI
Difference Blocks Set Util Q
07/06/2000
09:15 1.000 0.000 0.570 0.000 *107.000
10:15 1.000 0.000 0.590 0.000 *111.000
This would mean I/O-request are stacking up in the SCSI-queue. With 6 HDD the SCSI parameter should not be higher than about 30. In practice it's always around 90-110. I am always getting results like this ever since the Oracle has been in production-use.
I'm using both 12H-controllers with 96Mb each and they are cross-linked and both are used.
Is there an other way to improve performance ?
Maarten van Maanen
Netherlands
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тАО07-06-2000 07:10 AM
тАО07-06-2000 07:10 AM
Re: HP AutoRAID 12H performance
The best way to increase performance is to check the following things.
1)If you had the firmware HP54 or higher you can switch the Diskarray in 4 diiferent mody. The normal modus which is default and Highperformance modus. The best way is to switch to High performance modus.
2) Check with arraydsp the space of RAID 1/0 space. If it is two small than you need more disk space to get higher performance.
3)Load blancing must be used. The normal config is 4-6 Lun. 2-3Lun's on each controller.
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тАО07-06-2000 10:07 AM
тАО07-06-2000 10:07 AM
Re: HP AutoRAID 12H performance
Brian
<*(((>< er
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тАО07-10-2000 07:47 AM
тАО07-10-2000 07:47 AM
Re: HP AutoRAID 12H performance
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тАО07-11-2000 02:24 AM
тАО07-11-2000 02:24 AM
Re: HP AutoRAID 12H performance
After that just control that there is enough Gigs!!!
The more disks you add, the more perf you will have.
Don't bother about the 'wasted' space, someone in your company will need it one day!!!