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26469
August 11th, 2011 03:00
Dell powerconnect 55XX question
Hello,
This is my first post on the usefull "delltechcenter" website.
I am sorry to start like this, but my first question is about networking. I know I am in the storage section but I didn't find the networking one.
Since iSCSI storage often deal with network question, I try here...
This is the configuration :
For a client, we've installed a new infrastructure using 3 hdmi stacked powerconnect 5548 as a core network.
The powerconnect stack is used for classic network and iSCSI network (Vlan is used for isolation, jumbo frame is activated, flow control enabled on all iSCSI port, fast STP enabled on all used port)
The SAN consist of two replicated datacore servers (R710 with MD1200s) connected to the powerconnect stack using each 2*10 Gbits intel ports in team. To add redondance the 2 ports of each datacore are connected to 2 differents switch in the stack. The 8 ESX 4.1 have 2*1 Gbits iSCSI interface (1 in iSCSI1 Vlan on switch ID1, 1 in iSCSI2 Vlan on switch ID2)
Each ESX use 2 team (LAG) :
* 1 team for service console and vmotion : 2*1 Gbits (to switch ID1 and 2), vlan to separate SC and Vmotion
* 1 team for VM access : 4*1 Gbits (to switch ID 1,2,3), Vlan to acces different network
The problem / question :
Last night, we had latency problem on one datacore and I suspect hdmi stacking bandwith limitation on PE5548. If I enable only the 10Gbits SAN01 interface on the same switch as the ESX iSCSI1 interface, it works well. If I enable only the other interface, I get latency...
My question :
I would like to know if there a command on the powerconnect to check the HDMI stacking bandwith. Maybe using SNMP ?
I hope someone will have an answer,
Regards,
frouxel
This is my first post on the usefull "delltechcenter" website.
I am sorry to start like this, but my first question is about networking. I know I am in the storage section but I didn't find the networking one.
Since iSCSI storage often deal with network question, I try here...
This is the configuration :
For a client, we've installed a new infrastructure using 3 hdmi stacked powerconnect 5548 as a core network.
The powerconnect stack is used for classic network and iSCSI network (Vlan is used for isolation, jumbo frame is activated, flow control enabled on all iSCSI port, fast STP enabled on all used port)
The SAN consist of two replicated datacore servers (R710 with MD1200s) connected to the powerconnect stack using each 2*10 Gbits intel ports in team. To add redondance the 2 ports of each datacore are connected to 2 differents switch in the stack. The 8 ESX 4.1 have 2*1 Gbits iSCSI interface (1 in iSCSI1 Vlan on switch ID1, 1 in iSCSI2 Vlan on switch ID2)
Each ESX use 2 team (LAG) :
* 1 team for service console and vmotion : 2*1 Gbits (to switch ID1 and 2), vlan to separate SC and Vmotion
* 1 team for VM access : 4*1 Gbits (to switch ID 1,2,3), Vlan to acces different network
The problem / question :
Last night, we had latency problem on one datacore and I suspect hdmi stacking bandwith limitation on PE5548. If I enable only the 10Gbits SAN01 interface on the same switch as the ESX iSCSI1 interface, it works well. If I enable only the other interface, I get latency...
My question :
I would like to know if there a command on the powerconnect to check the HDMI stacking bandwith. Maybe using SNMP ?
I hope someone will have an answer,
Regards,
frouxel
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tom_minerd
5 Posts
0
October 5th, 2011 11:00
You can use the "show switch" command to view which ports are uplink and which are downlink, and what other stack ports they connect to, but that's about it.
A question I have is, are you connecting servers to the 10Gb/s SFP+ ports on the 5548s? Those ports are to be used only as 10Gb uplink to a 10Gb switch like a Dell PowerConnect 8024F. They should not be used to connect servers or other end devices, although it will physically connect. The stacking bandwidth is not designed to handle 10Gb traffic between switches in addition to the multiple 1Gb/s connections.
Hope this information helps.
Tom
frouxel
2 Posts
0
October 21st, 2011 03:00
We've built the configuration with Dell people and they didn't advertise us when we asked them if we could connect server on the 10Gbe port of the switchs.
Regarding the stacking hdmi "limitation" we have make some change on the architecture.
In the 3 powerconnect stack, switch1 manage iSCSI1 only on switch2 manage iSCSI2 only, no iSCSI go through the HDMI stacking cable then. The infrastructure works well but it is a little disappointed that we haven't been advise before installation.
Since it works well like that, do you think this configuration is not supported by Dell ?? (server connected on the 10Gbe ports of the switch)
For middle size deployment, PC55XX is a lot cheaper than PC8024... for an 1/10Gbe iSCSI dedicated switch.
Regards,
Florian