Re: FC Performance vs SAS

It's mostly the same thing - customer call *after* someone sold a box and issues arise.

E1D is a nice small box (P05 group with 256GB RAM), some business partneres here sell them a lot.

Will visit the customer next week for hands on and verifying a switched configuration.
Also FC cards are mounted in slots which are 32Bit DMA capable. The ethernet cards
are mounted in 64Bit DMA capable ports... *sigh*

Thanks for your input, i will report later.

-h

Am 06.12.2018 um 19:13 schrieb DrFranken <midrange@xxxxxxxxxxxx>:

So yes this is a technically unsupported environment. However 4GB fiber cards ARE supported for direct attach as are 16GB Fiber cards. And 8G cards are supported for DS8xxx models direct attach. So it's probable that this works just fine but as IBM did not take the time to test it, that makes it unsupported.

So while this is NOT something we would implement for our customers or recommend let's don't throw the poor customer under the bus because someone else 'did a bad thing' here.

I would focus on the issues mentioned such as disk response time and such. Assure multiple paths are configured as well although from a pure performance standpoint we do NOT see fiber path utilization as an issue hardly ever. Mostly they never even touch 1G even when the system is doing significant I/O.

E1D was not a popular box for IBM i though I don't think that is an issue here.