Discussion about speed and observation

[vkeven]

I repeat the test with 1.5GB file ( 1519MB ) and it take 30s ( 50.6MB/s ) so I think that my theory is correct , if I follow this theory this mean that you need to have enough RAM to buffer every simultaneous writing to all target if you want the maximum speed of your hardware. I think that possibility to put swap space on a separate drive like SAS 15K could be a great way to reach constant good speed without putting 16GB of RAM in your target server, Open-E do you think that its possible?

Keven
Have a good day!

PS: I'm Open to do some test.

[netsyphon]

PS - me too..

[vkeven]

Finally I put 5GB of RAM in my server but the same problem happen so I delete my iscsi target , deleted my iscsi volume , recreate every thing from scratch , used internal Dell Raid on 280GB target in Basic and GPT , used 2TB volume size on Xraid in Basic Disk and GPT, used 2.5TB in GPT and I could not reproduce the problem so the only options that I did'nt test was the initialize when you create an ISCSI volume, as soon as I recreated a volume with initialize fonction TADA problem come back , I created a 8GB volume with initialize function turn on and from this point my target become sluggish and irregular when I used it , if I create a volume without initialize everything is working like is suppose to so now I don't know where to look at

[vkeven]

It's look like I'm talking with myself ( Yes I admit that I'm a little crazy)


Ok now I have 2 volume with ISCSI target both locate on my AppleXraid over fiber

1 x 8GB with initialize and 1 x 8GB without initialize both are mount on windows 2003 with MS ISCI initiator ( I tried also with startport ) one is Hnot initialize) and one is Ginitialize) , if I copy on G: its become sluggish during copy and windows go from 40s to 2min to 40s to 1M for evaluation copy time, if I used H: windows write 45s and it take 35s to 40s steady.

Suggestion,does initialize is really need?what is initialize exactly , I can probably look into source code but I would like obtain some feedback from Open-E

[vkeven]

OK now I think that initialize fonction is not working properly or at least its causing some slownness issue , I retry my test above with internal dell 280gb raid 5 ( 5gb initialize and 5 gb not initialize ) same result initialize = slow and sluggish . Oh good , my customer badly need his new storage server and think that I would need to go with SAN/IQ from lefthand

[To-M]

And the Price will go up $$$$$ big time (DSS $1250.00 USA and SAN/IQ 20x that amount). I have some info for you on your tests and some of your questions but you are in 10GB speed mode .

Can you send me logs from the DSS and are you using the Demo-CD version 1.23?
If so email me so I can give you the FTP access for a different version.

If you are using the USB then email me so I can give a special version that should change your stats

Email: todd.maxwell@open-e.com

[vkeven]

And the Price will go up $$$$$ big time (DSS $1250.00 USA and SAN/IQ 20x that amount). I have some info for you on your tests and some of your questions but you are in 10GB speed mode .

Can you send me logs from the DSS and are you using the Demo-CD version 1.23?
If so email me so I can give you the FTP access for a different version.

If you are using the USB then email me so I can give a special version that should change your stats

Email: todd.maxwell@open-e.com

Money is not the point here ( I just sent you a PM about that ) , customer that play with 16TB of data in general have enough money to buy from lefthand or isilon or any other big player but I prefer to put my money into and more human company.

I used 1.23 Demo and I'm already having FTP access so just point me into right folder

[netsyphon]

hmm.. ill do similar tests with the init and non-init and see what i get.

also, maybe you could use iozone for benchmark data?

my command is as follows:
iozone -Razb c:\pro1000mt_test_9650se-wbcache-ncq-softinitiator.xls -f G:\tesfile.lo1


maybe open-e engineers can give us a baseline of what we should expect with performance? personally i want to be able to saturate my ethernet before i saturate my disks but it seems i cant saturate either!

[vkeven]

And the Price will go up $$$$$ big time (DSS $1250.00 USA and SAN/IQ 20x that amount). I have some info for you on your tests and some of your questions but you are in 10GB speed mode .

Can you send me logs from the DSS and are you using the Demo-CD version 1.23?
If so email me so I can give you the FTP access for a different version.

If you are using the USB then email me so I can give a special version that should change your stats

Email: todd.maxwell@open-e.com

I can't find where to view that log