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SC5020 new install
Hi
I have a sc5020 (2 of them), with a iSCSI card on top of the normal io ports.
and a arista mlag switch for each chasis
Fault domains, currently I have
C1
P1 -> top sw
P2 -> bottom sw
C2
p1 -> top sw
P2 -> bottom sw
My current fault doamins are
FD1 C1-p1 & C2-P2
FD2 C1-p2 & C2-p1
The dell guy who was installing was saying this is not a supported setup and that i can have
FD1 C1-p1 & C2-P1
FD2 C1-p2 & C2-p2
or
FD1 with all the 4 ports in there.
trying to find a best practise document for this.
I am thinking of going to 1 FD. This is for a VMWare 5.5 env. My presumption is that I have 1 discovery ip and that the hosts will attach to all 4 of the underling ports ?
and that packets sent will be round robined between the actual ports
BVienneau
115 Posts
1
December 1st, 2017 07:00
You want to have ports in the same switch to be in the same fault domain so what he recommended is correct.
All SC Best Practices:
http://en.community.dell.com/techcenter/storage/w/wiki/5018.sc-series-technical-documents
SC & VMware Best Practices:
http://en.community.dell.com/techcenter/extras/m/white_papers/20441056
AlexSYB
76 Posts
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December 1st, 2017 10:00
Do you know why.
Because to me that means you have a single point of failure. if the switch dies you loose the fault domain, atleast if you cross p1 - p2 you remove the single point of failure
BVienneau
115 Posts
0
December 1st, 2017 11:00
Volumes live across Fault Domains not within a fault domain so there's no single point of failure.
AlexSYB
76 Posts
0
December 3rd, 2017 20:00
So my experience with equa logics - which I am replacing with the compellents.
Is something like this. Each path accepts IO. if a path fails - so if I loose a switch a FD and there fore a path will fail. IO will back up until such time as it registers as down.
In these circumstances, I see IO waits sky rocket on Linux VM's and affect long lived tcp session.
So I am attempting to make sure I don't have a single point of failure.
Not one has yet told me why my cross setup is bad / wrong. only that its not the current best practise.
AlexSYB
76 Posts
0
December 6th, 2017 18:00
Doing a training course on SC.
Seems like the issue is I have a stacked / MLAG set of switches and its not really separate fabrics.
I'm going to move to 1 FD and 4 ports