Hello, Sorry for cross-posting to the 2 lists, but I think this topic can concerns both... I've made some tests on IP over FC. Here are the elements : - 2 high-perf servers with RAID SCSI disks, 1 GB RAM, dual PIII processors and a 2.4.18 SMP enabled linux kernel - 2 Qlogic qla2200f HBAs - 1 Qlogic Sanbox2 FC switch - 2 Intel optical Gigabit ethernet NIC The 2 servers are connected to the FC switch with optical links. There is a crossover cable between the 2 gigabit NIC First, it's really great to use FC switch also for IP data, it's useful when using NFS access mixed with Data on external FC RAID controller (for the moment shared file system are not as reliable as we would like and GFS is no more opensource). For example, you can have some unique datas for each server and some data (ie web data, etc...) for both, and using failover script, you can have the survivor mounting the partition of the dead server and no service failure... So, no problem to compile and load qlogic driver. Tests haven't shown any problems with reliability. The only thing that surprise me is performance issues using FC over IP. * with IP over FC : I have around 21 MB/s performance using a big file (600 MB) transfer by FTP * with IP on Gigabit Ethernet : I have around 33 MB/s with the same test using similar conditions (same file, same directory to store it). I renewed a lot of time the tests to be sure they are not altered with I/O access and swap problems. There were no other activities on the FC switch. So, why do I have these performance issues ? Is it inherant to the IP over FC architecture, to the qlogic driver ? Is there any tuning ? Thanks in advance for your help... -- Fabien - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
