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FMorales
Contributor
Contributor

Change from iSCSI to HBA

Hello, I am going to install a Qlogic HBA on one ESX 4 that connect with a EMC SAN using iSCSI......

If I plug a HBA on the ESX and setup the HBA for "see" the same LUNS that iSCSI software initiator ....

Do I have to disable iSCSI protocol on the ESX if I install the HBA?

Could I have both protocols enable?

Thanks a lot

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Francisco Javier Morales López de Gamarra

Vmware VCP | LPI - CCNA

Francisco Morales López de Gamarra Vmware VCP | LPI - CCNA
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a_p_
Leadership
Leadership

Do I have to disable iSCSI protocol on the ESX if I install the HBA?

Could I have both protocols enable?

I think there will be no issue to have the software and the hardware iSCSI adapter enabled at the same time. However, I would not present the same LUNs to both initiators. Since these are the same disks (i.e. same disk ids...) I don't think this will be handled properly by the VMkernel. I doubt MPIO is able to manage paths across different initiators.

André

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athlon_crazy
Virtuoso
Virtuoso

By using iscsi software, TCP/IP stack for iscsi connection will be handled by your CPU host which could provide significant workload on your host specially during any type of signifant I/O load(iscsi processing). While this iscsi process will be offloaded from CPU host when you use the HBA type of iscsi.

http://www.no-x.org
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Andy_Banta
Hot Shot
Hot Shot

Both the SW initiator and HBAs will see the same storage and paths work correctly. Nothing bad happens.

This is not a supported configuration, due to lack of testing.

Andy

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