Unsolved
This post is more than 5 years old
1 Rookie
•
7 Posts
0
3518
March 11th, 2019 13:00
MD3600i speed issue
Dear All.
I've problem with MD3600i Array (iSCSI). I've inside 8 pcs. of ST3000NM0023 disk.
Currently for testing purposes array is configured in RAID 10.
Although I read best practice docs, and browse similar problems in forums, I still have problem.
The point is the array working very slow, when I copy vm disk to array it is coping with 200 - 250 Mbit/s speed. Windows is showing diffent speed for few seconds (probably buffers) but I can see i task manager real speed, as I said 200 - 250 Mbit/s
When I copy example harddisk image back to the computer, speed is much better approximatelly 1800 - 2600 Mbit/s.
I've changed switch, I switched on flow-control, jumbo frame (on array and switch and Server), few diferent cmoputers and systems including 2012 R2 Server and 2019 Srv, changed NIC from broadcom to Intel, firmware is updated on disk and on array to newest but speed is not changed.
I've problem with MD3600i Array (iSCSI). I've inside 8 pcs. of ST3000NM0023 disk.
Currently for testing purposes array is configured in RAID 10.
Although I read best practice docs, and browse similar problems in forums, I still have problem.
The point is the array working very slow, when I copy vm disk to array it is coping with 200 - 250 Mbit/s speed. Windows is showing diffent speed for few seconds (probably buffers) but I can see i task manager real speed, as I said 200 - 250 Mbit/s
When I copy example harddisk image back to the computer, speed is much better approximatelly 1800 - 2600 Mbit/s.
I've changed switch, I switched on flow-control, jumbo frame (on array and switch and Server), few diferent cmoputers and systems including 2012 R2 Server and 2019 Srv, changed NIC from broadcom to Intel, firmware is updated on disk and on array to newest but speed is not changed.
Can you advice something ?
No Events found!
DELL-Sam L
Moderator
•
7.6K Posts
0
March 12th, 2019 06:00
Hello NellPola,
How many ISCSI ports are you using per controller? Do you have multipathing configured, if so which policy are you using?
Please let us know if you have any other questions.
NellPola
1 Rookie
•
7 Posts
0
March 12th, 2019 07:00
Hello.
Now for testing purposes I've two 10Gbits interfaces connected to 10G Switch and to serwer using one 10g NIC.
Because MPIO don't changed anything, I had clear reinstaled Windows 2012 R2 Sever and configured only one path to array using computer NIC and one first IP address of Array iSCSI available adresses. I made as simple configuration as possible, but it still works bad.
If I configure MPIO it is similar behavior but divided for 4 NIC's.
In windows first time I used MD Storage configuration utility to configure MPIO,
DELL-Sam L
Moderator
•
7.6K Posts
0
March 13th, 2019 07:00
Hello NellPola,
It is best to have 2 iSCSI ports per controller configured on your MD3600i. When you have only one iSCSI port per controller configured, you can see slower read & write speed due to all traffic going through a single port on each controller.
In our deployment guide we have the different ways that you can configure your MD3600i if it is a single controller or dual controller. If you have a second nic that you can use in your server and add a second iSCSI connection for each controller you should see improved speeds. Here is the link to our Deployment Guide. https://downloads.dell.com/manuals/common/powervault-md3600i_deployment%20guide_en-us.pdf
Please let us know if you have any other questions.
NellPola
1 Rookie
•
7 Posts
0
March 19th, 2019 11:00
I read this document, thank you, I checked the solutions contained in it, but it still does not work as it should, maybe the photo I attached something will tell you. The graph clearly shows that the transmission is broken at a certain time …. (it was some iso image....)