I'm the senior sysadmin for the company I work for. We do linux based health information management servers. On our servers, we typically have three modems (support, claims, fax) and sometimes various lab instruments that all connect via serial.
Right now, we use an 8 port serial card by Equinox/Avocent (SST-8), but the driver quite honestly sucks. The device doesn't have native kernel support, and the source they supply for a kernel module doesn't like to compile against current kernel versions. I'm basically sick of fighting with it.
I've considered using USB->Serial adapters, but would rather stick with a PCI card.
Does anyone have positive experiences with any of the (8 port or above) serial cards out there that have native kernel support? Any suggestions would be greatly appreciated.