Two types of initiator stacks

[Bobby]

Under section "How to setup iSCSI interfaces (iface) for binding" of README, there is this paragraph:

" To manage both types of initiator stacks, iscsiadm uses the interface (iface)
structure. For each HBA port or for software iscsi for each network
device (ethX) or NIC, that you wish to bind sessions to you must create
a iface config /etc/iscsi/ifaces. "

 Here I am confused. Which both types of initiator stacks we mean here?

Thanks !

[Donald Williams]

Hello, 

 

 It is referring to iSCSI HBA cards like Broadcom BCM58xx/57xxx or just using a standard NIC and the Software iSCSI adapter open-iSCSI provides. 

Regards, 

Don 

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[Bobby]

ah OK thanks !

On Thursday, January 9, 2020 at 7:35:07 PM UTC+1, Donald Williams wrote:

Hello, 

 

 It is referring to iSCSI HBA cards like Broadcom BCM58xx/57xxx or just using a standard NIC and the Software iSCSI adapter open-iSCSI provides. 

Regards, 

Don 

On Thu, Jan 9, 2020 at 11:57 AM Bobby <italien...@gmail.com> wrote:

Under section "How to setup iSCSI interfaces (iface) for binding" of README, there is this paragraph:

" To manage both types of initiator stacks, iscsiadm uses the interface (iface)
structure. For each HBA port or for software iscsi for each network
device (ethX) or NIC, that you wish to bind sessions to you must create
a iface config /etc/iscsi/ifaces. "

 Here I am confused. Which both types of initiator stacks we mean here?

Thanks !

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[Donald Williams]

Hello, 

 You are very welcome.  

Also, iSCSI offload cards like the Broadcom (Now owned by Qlogic) are typically called "dependent hardware initiators'.  Since it depends on connection to the OS network stack to make it fully functional.  Otherwise, it behaves just like a standard NIC. 

Cards that completely offload the network and iSCSI functions are known as "Independent hardware initiators'.   Since they don't require that OS network connection.  They appear solely as a SCSI adapter to the OS.  All the network configuration is done on the card.  Qlogic used to make the best examples of this.  The Qlogic 4xxx series iSCSI HBAs.   Now you see this in cards that support DCB, they are called "Converged Network Adapters"  CNAs.   Since very few Software Initiators support DCB naively the card has to handle everything.  

Regards, 

Don 

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[Bobby]

Hi Donald,

Thanks a lot ! That was a very nice explanation...Now the concept is clear to me :) !

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