I have a 16-port Areca ARC-1260D PCIe RAID card and I was planning to use it as one large array (either RAID 10 or RAID 6). I didn't think about if it was possible to split up the RAID card into two (or more) different RAID arrays. The card in question supports multiple RAID selection.
Is there a large performance drop off (or any other caveats) in using multiple RAID selections off a single adapter? Typically, I've used RAID adapters for one single array at a time so I'm not sure if it's wise/unwise to use multiple RAID sets on a single adapter. Initially I was planning to use the entire array for VMs for XenServer, but now with this option, I'm thinking of making one array for the VMs, another for simple file storage.
Edit: This is for SATA, not SAS. Initially I was looking to fill the array with 1.5TB SATA disks, but the price for 2TB disks has fallen dramatically and I'm thinking of having two RAID arrays on the card; 1 array with 6-8 1.5TB disks, the other with 6-8 2TB disks.