iSCSI and NX-OS

Answered Question
Jul 7th, 2012

    Thrown into a project starting Monday with 2 5548 switches and the customer wants to do SMB, iSCSI, and NFS. It is coming with a layer 3 card so I get the NFS and SMB. But isn't there a feature to be enabled with NX-OS or lun database to set up? Haven't turned up much in the configuration guide and I'm beginning to this it's just going to be ethernet connectivity throughout, so just a sanity check if anyone has done iscsi on a nx-os is what I am looking for.

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Correct Answer by krun_shah about 1 year 9 months ago

I do not think any special needs to be done on a network switch which just switches iscsi frames from one port to another.

You can do some QoS and set MTU and queue-limit etc. it this switch is also shared with data traffic. Following is one type of example where servers has to mark the iscsi frames with CoS 2 and you can set the value of MTU.

class-map type qos iSCSI-qos-class

match cos 2

policy-map type qos iSCSI-qos-policy

class iSCSI-qos-class

set qos-group 2

class-map type queuing iSCSI-queuing-class

match qos-group 2

class-map type network-qos iSCSI-network-class

match qos-group 2

policy-map type network-qos iSCSI-network-policy

class type network-qos iSCSI-network-class

mtu 9216

system qos

service-policy type qos input iSCSI-qos-policy

service-policy type network-qos iSCSI-network-policy

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Average Rating: 5 (1 ratings)
Correct Answer
krun_shah Wed, 07/11/2012 - 09:24

I do not think any special needs to be done on a network switch which just switches iscsi frames from one port to another.

You can do some QoS and set MTU and queue-limit etc. it this switch is also shared with data traffic. Following is one type of example where servers has to mark the iscsi frames with CoS 2 and you can set the value of MTU.

class-map type qos iSCSI-qos-class

match cos 2

policy-map type qos iSCSI-qos-policy

class iSCSI-qos-class

set qos-group 2

class-map type queuing iSCSI-queuing-class

match qos-group 2

class-map type network-qos iSCSI-network-class

match qos-group 2

policy-map type network-qos iSCSI-network-policy

class type network-qos iSCSI-network-class

mtu 9216

system qos

service-policy type qos input iSCSI-qos-policy

service-policy type network-qos iSCSI-network-policy

krun_shah Wed, 07/11/2012 - 09:25

Also to set up MTU on the SVI vlan interface.

Interface vlan 10

mtu 9216

vlabua Thu, 07/12/2012 - 21:23

Don't route the iscsi and do testing with and without aggregated links to hosts and storage. They can sometimes affect the session handling and cause performance issues.

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Posted July 7, 2012 at 11:34 AM
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