HPE EVA Storage
cancel
Showing results for 
Search instead for 
Did you mean: 

Re: Slow Copy Performance in SAN

 
Glenn Joseph Andal
Frequent Advisor

Slow Copy Performance in SAN

We currently encounter the following issue:

We are copying Files from one Filesystem to another Filesystem, both located on the same Storage Device (EVA6400) and within the same Blade. The copy process is extremely slow (10 GB in 45 min).

System Involved: HP Integrity BL870c, Storage Involved: HP EVA6400

Hope someone can help us on this.

Thanks,

Otep
7 REPLIES 7
Johan Guldmyr
Honored Contributor

Re: Slow Copy Performance in SAN

Hi, are you sure the Files are not copied to the blade's local disks in between?

Are both file systems mounted on one blade server?
Are they from two different LUNs?
When you created the file systems (which fs by the way?) did you do any tuning? What is the block size etc?

If you do reading or writing to one of the filesystems - is the speed acceptable then?

On the EVA - how many disks in the disk group and what RAID? What type of disks?
What kind of files are you copying?

There are tools to measure performance - check out iometer.
Glenn Joseph Andal
Frequent Advisor

Re: Slow Copy Performance in SAN

Hi, are you sure the Files are not copied to the blade's local disks in between?

>>> im doing native cp command. We are not using local disks but SAN storage via EVA6400

Are both file systems mounted on one blade server? yes
Are they from two different LUNs? yes
When you created the file systems (which fs by the way?) vxfs
did you do any tuning? no
What is the block size etc? 8192

If you do reading or writing to one of the filesystems - is the speed acceptable then? no

On the EVA - how many disks in the disk group and what RAID? 40 disks RAID5 What type of disks? FC
What kind of files are you copying? text files

There are tools to measure performance - check out iometer.
Johan Guldmyr
Honored Contributor

Re: Slow Copy Performance in SAN

8192Bytes? The EVA prefers 128kbytes but maybe this is not the best for your application. Would you be able to try with bigger?

What about fc_hba settings? queues etc,

Do you have any other servers connected to the EVA that are fast/slow too?
Michael A. McKenney
Respected Contributor

Re: Slow Copy Performance in SAN

RAID 5 writes can have poor performance. I would do RAID 10. I have seen parity writes from copying small files just overwhelm write performance on SANs and storage. RAID 10 does not do parity.
charles yoakum
Occasional Advisor

Re: Slow Copy Performance in SAN

What is the OS? If it is MS OS then you might want to change a seeting on the MS OS side.
What do you have for the Fabric switches and are they and the server HBA's set to 4 or 8 GB? What is the speed of the PFS plug for your fabric switchs?
I have this EVA 6400 system and other EVA's and fabric switches and you should be getting a better speed.
Is your filesystem on just one LUN and is anything else on the same LUN. if you have only this system on this LUN then you can do a EVA clone if you have the rights.
More info would be helpfull to help you.

Fedon Kadifeli
Super Advisor

Re: Slow Copy Performance in SAN

We have the same problem. Any ideas?
charles yoakum
Occasional Advisor

Re: Slow Copy Performance in SAN

Can you provied more detail.