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тАО02-21-2005 07:57 AM
тАО02-21-2005 07:57 AM
Poor Performance on VA 7110
I have a VA 7110 attached to a HP9000 server.
The problem is poor performance.
I setup a test. I copied a 1.5 GB file from serverтАЩs local scsi hard disk to a LUN that made on array. After that I copied that file from array to ServerтАЩs HDD. And finally copied the file form a LUN on array to another LUN. I made a logical volume for each LUNs. I mean in this test, the file copied from a LV to another LV.
I calculate the speed by measuring the time took for completing the each test.
HDD to Array : 33MB/s
Array to HDD: 17 MB/s
Array to Array : 44 MB/s
I read in HP documents that VA 7110 throughput is 200 MB/s
This is my Array configuration:
##Port Settings:
Topology = FABRIC Attached
Port Data Rate = 2Gb
Queue full Threshold: 1024
Port Behavior: HP-UX
##Array Settings:
Raid: Raid 1+0
Data resiliency: High performance
Hot Spare Mode: Automatic
What is the problem?
Please advice.
Alire
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тАО02-21-2005 06:58 PM
тАО02-21-2005 06:58 PM
Re: Poor Performance on VA 7110
I belive the 200MB/s relates to the FC interface and, perhaps to cached read/writes, not reading/writing from disks.
The VA7110 uses something called AutoRaid, part of the array works in Raid 10, the rest in Raid 5DP (Double Parity). Raid 5DP has a very high write overhead which may be one reason for your limited performance. If I have understand correct, it is possible to configure the array for Raid 10 only. This may give better write performance but, to the cost of disk space.
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тАО02-21-2005 08:48 PM
тАО02-21-2005 08:48 PM
Re: Poor Performance on VA 7110
with RAID1+0 setting and 2Gb Fabric attach, there are basically just the two major options to increase VA performance: more cache memory, more disks.
Regards,
Bernhard
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тАО02-21-2005 11:12 PM
тАО02-21-2005 11:12 PM
Re: Poor Performance on VA 7110
This array has 15* Scsi 10k Hard Disk.
In this situation (This Platform and the configuration I determined in my first email), Is this performance acceptable or not?
I think 33 MB/s is too low for this array.
What is your idea?
Alireza
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тАО03-31-2005 12:03 AM
тАО03-31-2005 12:03 AM