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2 Intern
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192 Posts
0
37324
February 22nd, 2012 11:00
packet loss on iscsi network
I want to make sure that jumbo frames is configured correctly.
On my network adapters for ISCS i have enabled jumbo frames. 9014MTU
On my switch (power connect 6224 x2) i have enabled jumbo frames on all ports 9216MTU
On the Equallogic PS4100E i have enabled jumbo frames 9000MTU
I also have 2 adapters on each node being used for ISCSI and they are on the same subnet. I spoke wtih DELL Support / PowerConnect and the tech advised me to team my NICs. I did this and the packet loss was gone.
However teaming ISCSI NICs is frowned upon. So I would like to get this resolved. I would like to run 2 NICs per server (same subnet) without packet loss.
Can you help?
DELL-Kenny K
685 Posts
1
February 22nd, 2012 11:00
Dirkdigs,
I seen you also asked this on the following thread:
en.community.dell.com/.../19437683.aspx
Have you had a chance to try and get SAN HQ installed so that we can look into where the bottle neck is at? As far as the Jumbo Frames is concerned as long as it is enabled end to end on all devices then there shouldn't be any issues. There maybe something else and if we can get an archive file from SAN HQ it will help us figure out what is causing these dropped packets. Let me know if you need any assistance on the installation of SAN HQ.
dirkdigs
2 Intern
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192 Posts
0
February 22nd, 2012 12:00
yes i have SAN HQ installed and runing.
DELL-Kenny K
685 Posts
0
February 22nd, 2012 12:00
Once it has been running for at least 24 hours with the NICs no longer teamed (that way if there is packet loss we will see it.) Pull a SAN HQ Archive. You will either see the option as a button up top or in the SAN HQ menu in the top left. I will send you a direct msg with the directions on how to upload that file to me directly.
hkraal
1 Rookie
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41 Posts
0
February 23rd, 2012 02:00
Shouldn't the frames on the iSCSI port be at least equal or less than the smallest packet size in it's path? As I see it the iSCSI vmk can send a packet which is bigger than the size the EqualLogic can receive.
So this would at least cause fragmentation of the packets and so a unnecessary delay?