I recently bought a used IBM X3650 M4 for testing and development. This server ships with a built-in RAID card, the ServeRaid m5110e.
I'm using it in JBOD mode on all disks (2 x HDDs and 6 x SSDs) and configured software RAID on Ubuntu using mdadm.
I would like to know from experts like you if that controller could be a bottleneck and if I should buy a dedicated HBA card. In other words, how can that controller affect performance against a dedicated HBA SAS/SATA 6Gb/s?
Another question: a 12Gb/s HBA controller will improve performance even with 6Gb/s SAS/SATAIII disks?
Thank you very much