StarWind Software

In windows if I disable even a single network adapter on any server all traffic halts for 17 to 25 seconds is this normal is there a way to reduce this time or to not have it happen at all?

Configuration/Usage Below:
Starwind version 5.7.1807
Servers are all running 2008 R2 Enterprise
I have starwind configured in HA mode with 2x10GBE cabled to each switch.
The HyperV hosts currently have 4x1GBE dedicated to ISCSI.
This is on a dedicated storage network.

I have applied your recommended network settings to the starwind servers
http://www.starwindsoftware.com/forums/ ... t2293.html
I have jumbo frames enabled.
MPIO policy is set to use round robin.

Using Barts test stuff I run a stream of data to the mounted ISCSI drive.
All network adapters light up and I see network utilization on all storage server adapters and hyperv adapters.

Starwind 1
10.254.1.50 -> switch A
10.254.2.50 -> switch B
Starwind 2
10.254.3.50 -> switch A
10.254.4.50 -> switch B

HyperV 1
10.254.1.51 -> switch A
10.254.2.51 -> switch B
10.254.3.51 -> switch A
10.254.4.51 -> switch B

Are any of you familiar with this microsoft kb
http://support.microsoft.com/kb/2522766

Could you please provide us with detailed network diagram and specify what exactly NICs on what exactly servers have you disabled?

Thank you

I have attached a picture of the network layout.

After I disable/unplug the single nic from store02. Every ISCSI network connection hangs for 10-30 seconds.

Is this to be expected with MPIO a single connection lost makes all clients stop sending traffice?

Dear ggalley,

Since you are using two servers I am assuming that you are using HA, so please see attached diagram with recommended settings (I haven`t specified all the IPs but I think you will get the idea):

Is this Gap normal with MPIO ISCSI failovers after a single NIC failure? I made the changes you request I am still getting the same results. I have configured my ISCSI to enable multi pathing and have multiple sessions. I have also configured my iscsi without enabling multi pathing with the same results.

Network activity while I have Barts test stuff running from hyper01 connecting to a single ISCSI mounted drive.
This is getting more urgent than a once a day response.

Dear ggalley,

First of all as I can use your ASM is valid so you are welcomed to use it (you can email us using support@starwindsoftware.com]this email), and you can expect that you will get response faster.

I would also like to ask you to clarify on what NIC exactly do you see the gap that you have specified?

Run remote session with them and publish results here. Should save quite a time on turn around. Thanks!

Anatoly (staff) wrote:Dear ggalley,

First of all as I can use your ASM is valid so you are welcomed to use it (you can email us using support@starwindsoftware.com]this email), and you can expect that you will get response faster.

I would also like to ask you to clarify on what NIC exactly do you see the gap that you have specified?