Hyper-V Failover Cluster FAILURE(S)
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I've only ever had a Drobo as a SAN for a backup target, so I have very little practical experience here - but I'd guess either the switch or the SAN itself is where the problem lies.
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@dashrender said in Hyper-V Failover Cluster FAILURE(S):
@kyle said in Hyper-V Failover Cluster FAILURE(S):
@scottalanmiller said in Hyper-V Failover Cluster FAILURE(S):
@scottalanmiller said in Hyper-V Failover Cluster FAILURE(S):
@kyle said in Hyper-V Failover Cluster FAILURE(S):
Essentially they are ensuring they are needed until the very end as the end game is to ensure all IT is brought in house instead of through a MSP.
Yes, that's called extortion and is very illegal.
So if we know that there is extortion, we know that there is a federal crime afoot, and we know that the CEO would fire you if you exposed it... I think that puts some big pieces together.
I only believe that because I am only a contractor right now and the "New Guy". I have pointed out several issues and they are all known and we are addressing them slowly but it is so tedious.
My biggest concern is that our Hyper-V Cluster keeps failing after we made IP changes and they claim the two issues are unrelated.
I've only ever had a Drobo as a SAN for a backup target, so I have very little practical experience here - but I'd guess either the switch or the SAN itself is where the problem lies.
We have a DATTO backup agent.
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Most common issue here is the SAN getting IO overload while doing snapshots.
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@scottalanmiller said in Hyper-V Failover Cluster FAILURE(S):
Most common issue here is the SAN getting IO overload while doing snapshots.
Actually there is no overload per the logs.
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Do the switches report any overloading? A huge backup at the L3 routing points could do this, but would be super uncommon. But SAN traffic should never be routed, ever, and this would be a reason for that.
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@scottalanmiller said in Hyper-V Failover Cluster FAILURE(S):
Do the switches report any overloading? A huge backup at the L3 routing points could do this, but would be super uncommon. But SAN traffic should never be routed, ever, and this would be a reason for that.
Switches are not reporting any errors either. We pulled all those logs and found no network errors or hardware failure.
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Is there a single switch that handles all traffic for SAN(storage traffic) and failover and network traffic for these hosts?
What kind of connection does the switch have to the router?
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@dashrender said in Hyper-V Failover Cluster FAILURE(S):
Is there a single switch that handles all traffic for SAN(storage traffic) and failover and network traffic for these hosts?
What kind of connection does the switch have to the router?
Due to a huge web of issues I couldn't tell you exactly how everything is connected but I do know the Servers and SAN's are on their own switches and then handed off to the LAN.
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@scottalanmiller how critical, and if not critical - then recommended, is having SAN traffic on it's own switches, not shared with anything else?
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@dashrender said in Hyper-V Failover Cluster FAILURE(S):
@scottalanmiller how critical, and if not critical - then recommended, is having SAN traffic on it's own switches, not shared with anything else?
Pretty critical. there is a reason that no one would ever try it any other way. SANs need low latency and you dont' want it waiting on a busy backplane. Also, a switch that is good for SAN is not good for the LAN and vice versa. So it wouldn't be cost effective to mix them anyway. Hence, it never comes up. No upsides, loads of downsides.
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@kyle said in Hyper-V Failover Cluster FAILURE(S):
@dashrender said in Hyper-V Failover Cluster FAILURE(S):
Is there a single switch that handles all traffic for SAN(storage traffic) and failover and network traffic for these hosts?
What kind of connection does the switch have to the router?
Due to a huge web of issues I couldn't tell you exactly how everything is connected but I do know the Servers and SAN's are on their own switches and then handed off to the LAN.
Handed off to the LAN? SAN traffic never goes on a LAN, ever. If it does, it means you have no SAN and just black storage traffic on the LAN. The whole point of a SAN is that it is completely isolated and doesn't intermingle with the LAN.
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@dashrender said in Hyper-V Failover Cluster FAILURE(S):
@scottalanmiller how critical, and if not critical - then recommended, is having SAN traffic on it's own switches, not shared with anything else?
I believe they did it to connect the 2 SAN's and 1 Datto that are connect via iSCSI on 10G connections and then the Hyper-V is handing traffic off to the LAN for everything else.
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@kyle said in Hyper-V Failover Cluster FAILURE(S):
@dashrender said in Hyper-V Failover Cluster FAILURE(S):
@scottalanmiller how critical, and if not critical - then recommended, is having SAN traffic on it's own switches, not shared with anything else?
I believe they did it to connect the 2 SAN's and 1 Datto that are connect via iSCSI on 10G connections and then the Hyper-V is handing traffic off to the LAN for everything else.
Those two SANs and the DATTO should be on their own switches that have no connections to the rest of the network.
I've read about people bitching that they have to have another control station to manage this mini network, but it's the cost of using SAN.
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@dashrender said in Hyper-V Failover Cluster FAILURE(S):
@kyle said in Hyper-V Failover Cluster FAILURE(S):
@dashrender said in Hyper-V Failover Cluster FAILURE(S):
@scottalanmiller how critical, and if not critical - then recommended, is having SAN traffic on it's own switches, not shared with anything else?
I believe they did it to connect the 2 SAN's and 1 Datto that are connect via iSCSI on 10G connections and then the Hyper-V is handing traffic off to the LAN for everything else.
Those two SANs and the DATTO should be on their own switches that have no connections to the rest of the network.
I've read about people bitching that they have to have another control station to manage this mini network, but it's the cost of using SAN.
The 172.20 is the servers & SAN. 172.30 is the internal network.
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@scottalanmiller said in Hyper-V Failover Cluster FAILURE(S):
@dashrender said in Hyper-V Failover Cluster FAILURE(S):
@scottalanmiller how critical, and if not critical - then recommended, is having SAN traffic on it's own switches, not shared with anything else?
Pretty critical. there is a reason that no one would ever try it any other way. SANs need low latency and you dont' want it waiting on a busy backplane. Also, a switch that is good for SAN is not good for the LAN and vice versa. So it wouldn't be cost effective to mix them anyway. Hence, it never comes up. No upsides, loads of downsides.
I assumed this to be the case, but haven't dug into it.
