"best" RAID configuration? in RAID Cards and HBAs Posted March 9, 2011 · Report reply I will give my advice also. As kremlar says i wouldnt go for a hotspare either, you just have too few disks, and i would also go for the best practice of splitting up logs and database volume, on a database server. as i see it you have two options: 1) Go for the high capacity option, and do a 4 disk raid 5 for Data, and a 2 disk raid 1 for OS/logs 2) go for the higher speed option and do a 4 disk raid10 for data, and a 2 disk raid 1 for OS/logs And yeah.. just buy a disk to have in reserve when you dont have hotspares. I believe SQL server writes 8K pages, im sure it can be googled fairly easy.