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no they don´t need system resources, but when you have high I/O Traffic at your array (over: SAS - 384 MB/s SATA - 150 MB/s) then you have a prob with performance - for that the more expensive controllers have the romb cache. it is a hardware raid card, but only raid 0/1 like posted, software...

the SAS5ir could only handle raid 0 and 1, no raid 5 or other possible, also you have less features: only 2 virtual disk to manage and max 4 HD´s one channel internal no external eclosure no cache

at the per5ir you can also use SAS HD´s (...and have 3.0 GB/s - Max burst speed per channel or port) - so we have the bottleneck at the HD´s and not at the controller. SAS - 384 MB/s SATA - 150 MB/s

hey "cndcadams" thanks for this, from where you get this?

A16643-310 board is compatible with the A16643-311 (3Y574) " - post both part numbers and i will have a look for.

sorry no chance with this controller! - by the way it´s not supported... as alternative you can install another raid5 later with the other HD´s to create another logical drive you can add the two logical drives to one in the OS if you need to have one partition - the problem is you will "lost"...

try to run default settings at the bios (all Led´s at the keyboard on then Alt+F) to solv the problem

sorry, this way is not supported by dell and also the controller, the best way to expand your array is to run complete backup create a new raid on yout PV and restore data... also your are preventing a corrupt raid with this