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Poor Performance on VA 7110

Delrish
Trusted Contributor

Poor Performance on VA 7110

Hi,

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 server’s local scsi hard disk to a LUN that made on array. After that I copied that file from array to Server’s 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
4 REPLIES
Leif Halvarsson_2
Honored Contributor

Re: Poor Performance on VA 7110

Hi,

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.
Bernhard Mueller
Honored Contributor

Re: Poor Performance on VA 7110

Alire,

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
Delrish
Trusted Contributor

Re: Poor Performance on VA 7110

Thank You,

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
Delrish
Trusted Contributor

Re: Poor Performance on VA 7110

Thank you