topic Re: Problem with Disk system 2405 in Disk Enclosures

Problem with Disk system 2405

Delrish — Fri, 07 Jan 2005 05:30:46 GMT

Hi

This is my first experience with Storages,So sorry if i asked silly question.

I have HP Disk System 2405 & a HP StorageWorks SAN Switch 2/8-EL

The problem is the performance.I copied a 4 GB file from local HDD to another local HDD in one of the servers and it took 6 mins to complete. BUT when i copied that file (4 GB) from local HDD to SAN it took about 50 mins to complete!.
What is the problem. I just crate a LUN in Disk system and connect it to the servers. All the things is defualt.Does it need some configuration to work well?
Please Advice

Regards,
Alireza

Re: Problem with Disk system 2405

Vincent Fleming — Fri, 07 Jan 2005 05:45:39 GMT

Yeah, there's something wrong there.

How did you configure the DS2405? Did you format the disks or use what was there already? Was it new, or from a disk array or something? What is the LVM configuration? How many drives are there in the DS2405? What size/speed? How is the switch configured?

Re: Problem with Disk system 2405

Delrish — Fri, 07 Jan 2005 05:55:08 GMT

Hi Fleming,

Yes it is new,
As i remember i executed just 2 commands on it.
1.fmt
2.cfg -L 1 -a 12g -g 1

I did not change anything else.switch configuration is as defualt, i did not change it.

Re: Problem with Disk system 2405

Arend Lensen — Mon, 17 Jan 2005 09:59:15 GMT

Alireza ,

It seems that you are using a VA disk array and not the 2405 JBOD in standalone config.
A disk array behaves different that a standalone disk or jbod. Many many things can cause slow performance. Loading a lun with a lot of data can make the array slow for a while. After it had time to perform the housekeeping performance will get better.

Regards,
Arend

Re: Problem with Disk system 2405

Nguyen Anh Tien — Tue, 18 Jan 2005 03:06:49 GMT

Check you storage again. If DS2045 you can not create LUN on. It must be at least VA. DS2405 is extend enclosure of VA7400, VA7410 or VA7100.

Re: Problem with Disk system 2405

Delrish — Tue, 18 Jan 2005 04:22:08 GMT

Hi,

It is DS 2405 , VA 7110 and HDDs are 10k. What should be the speed of read & write on this system?
The ports on both server side and disk array, are configured at 2Gb/s.I copied a 4.5 GB from a local Hard disk on the server to the SAN, it took about 6 mins to complete. Is it ok? I think it should be faster.

Alireza

Re: Problem with Disk system 2405

Delrish — Thu, 31 Mar 2005 08:04:05 GMT

thank you