- Bronze, 100 points or more
In another attempt to get some MDS switches for our extended SAN, I have veto'ed using Tape drives between data centers until Brocade can tell me exactly how they have "got around Head of Line Blocking (HoLB)" if they don't have Virtual Output Queues (VOQ). They just said that it is not a problem anymore. The senior SE that I met said that buffer credits had been extended and this would stop any issues. He also said that virtual channels could be the fix. Mind you he looked at me blankly for about 2 minutes when I asked about HoLB...
Is VOQ a Cisco only method of getting around HoLB? I read in some forum that obviously hates Cisco that VOQ has been around for years and Cisco probably pinched the idea, etc, etc...
If that is the case, then why don't other switch vendors say that they have VOQ's or similiar technology to reduce the risk of HoLB?