Q-Logic HBA and Jumbo Frames

[shmed]

Hi All,

Having specced and installed a system using IBM 3650 M3 servers with ESXi 4.1 embedded and Q-Logic HBA's, and citing the use of jumbo frames thorughout the SAN, it appears that using jumbo frames with Q-Logic HBA's is not supported in ESX 4.x. Does anyone know if this is true?

http://kb.qlogic.com/KanisaPlatform/Publishing/319/1646_f.SAL_Public.html

Thanks

Paul

[vlho]

Hi shmed,

maybe it is not supported (I read that document also) but jumbo frame with hardware iSCSI Initiator (QLogic) works for my production system c. half year without problems...

[shmed]

Mine won't actually enable jumbo frames. When using esxcfg-hwiscsi -l vmhbax, the MTU shows as 1500. When I issue the -j command, I get an error enabling jumbo frames.

I thought this might be because it wasn't supported, but maybe not. Is there any kind of 'negotiation' between the HBA and the switch when enabling jumbno frames?

[vlho]

Hi,

command esxcfg-hwiscsi not worked for me too

You change jumbo frame in bios of QLogic HBA...

[Shmeds]

Perfect, all enabled from the BIOS. I checked the VMware HCL site and it seems that they make no reference to the card being unsupported for jumbo frames. I guess that means they are supported by VMware.

Cheers for the help