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March 30th, 2021 12:00
SCv3020 2 fault Domains and 2 Interconnected S4128 Switches
Hello,
I have 2 Dell S4128 Switches that are interconnected via VLT. We use these switches with our servers and they are top of the rack switches for me,
Dell SC documents states that switches do not need to be Interconnected, and that the fault domains need to be in a different subnet. I would like to keep my switch structure as it is - redundant and appear as one.
How can I accomplish the different subnets for the two fault domains?
Do the two subnets for the two Fault domains need to be on the same vlan?
Thank you and any help is appreciated.
Peter
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DELL-Josh Cr
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March 30th, 2021 16:00
Hi Peter,
It needs to be one subnet per VLAN. VLT should allow the switches to more or less be treated as a single switch in the configuration. Page 677 https://dell.to/3dmMFxo
Origin3k
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2.3K Posts
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March 30th, 2021 22:00
We use the s4128 a lot and having a lot of SCs with iSCSI too. The solution is indeed to use use one VLAN per Faultdomain. So every switch just hold one of the VLANs and not both which makes it impossible that the SC or Hosts can communicate over their 2 pathes trough a single switch.
We use the iVLT stuff over the 100G connnectors to create the VLT Domain for the switches as we use it with our Force10 switches from 10 years ago.
Switch A = VLAN 5(tagged)
FT 1 = VLAN5 (tagged)
CS = CM TOP Port1, CM BOTTOM Port1
Switch B = VLAN 6(tagged)
FT 2 = VLAN6 (tagged)
CS = CM TOP Port2, CM BOTTOM Port2
Regards,
Joerg
ygpyg
18 Posts
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March 30th, 2021 17:00
Thank you Josh, let me read that section and I will give you an update
thank you again
peter
ygpyg
18 Posts
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March 30th, 2021 20:00
Josh,
I went through those pages, I understand that part and it is setup exactly that way and works good right now.
I am introducing a new SC soon and unlike PS array it requires these two fault domains and the SC doc with S4180 shows that no interconnect between the switches, if I am not mistaken it said it is optional on SC but required in PS.
So create two subnets for the two fault domains and it will just work? So the two controllers are NOT active active then correct? Something is not clicking yet with me may be till I just do it and test it.
ygpyg
18 Posts
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March 31st, 2021 06:00
Joerg,
you put it simply there, thank you so much... I will try that tomorrow when I get my hand dirty with the SC. For some reason, till I saw your message, been struggling with the way The fault domains work. I appreciate your help very much. If I may add, so do the controllers work as a true Active Active?
Are there any considerations that I need to be aware of that is different when it comes to configuring the array with VMware?
Origin3k
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2.3K Posts
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March 31st, 2021 14:00
Take a look to http://downloads.dell.com/Manuals/Common/sc-series-vmware-vsphere-best-practices_en-us.pdf and be sure to read at least the last 3-4 pages because a lot of command line configuration is needed. Be sure to reboot the ESXi after apply all the settings and than present the volume from the SC to the ESXi Hosts.
Regards,
Joerg
ygpyg
18 Posts
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March 31st, 2021 19:00
Thank you Joerg, I appreciate all your help. Have a great day/evening!!
I will review the best practice guide.
Thank you again.