[Info-vax] ES47 2G FC and rx2800 i4 8G FC in same VMS Cluster with Shadowsets on shared storage controller? Is this possible?

[David Turner]

Joe
Might have a 4Gbit solution for Alpha for you

David
island computers



On 3/12/2020 8:44 PM, Jon Pinkley wrote:
> We currently have a cluster of two ES47s with 2G FC and an EVA6000 with
> 4G FC and 4G FC switches (StorageWorks 4/32B, HP relabeled Brocade)
> 
> We want to migrate to Itanium rx2800 i4 or i6 servers and a shared FC
> storage controller (perhaps 3PAR 8200?).  HPE said that the 3PAR has 16G
> FC and they were not very optimistic about us being able to use it with
> the ES47's.  They said that FC could go up/down 2 speeds, but others
> have said only 1.
> 
> Does anyone have an ES47 with 2G Emulex LP10000 FC HBA in a VMS Cluster
> with an Itanium server with 8G FC HBAs and some shared storage
> controller?  If so what storage controller?  This would be a migration
> config, and we plan to migrate storage from EVA to new storage using VMS
> Volume Shadowing (and VMS Clusters).
> 
> I also don't know if FibreChannel forces two communicating devices to
> negociated at the same speed, or if it is like a store/forward Ethernet
> switch and negociates each link at the lowest speed.
> 
> In other words, we currently have 4G switches, 4G EVA controller, and 2G
> ES47.  Does the FC link between the 4G switch and the 4G EVA operate at
> 4G and the link between the 4G switch and 2G ES47s operate at 2G, and
> the switch does store and forward speed conversion like most ethernet
> switches do?
> 
> Any pointers to useful documentation would also be appreciated.
>