1

RAID options with heterogeneous disks

view story
linux-howto

http://serverfault.com – I have a general purpose server which is running out of disk space. It currently has a RAID1 of two 2TB disks (WD RE4). So I'm going to buy two 4TB disks. I am considering the following options: Make a RAID0 of the 2TB disks, then a RAID5 of the three 4TB volumes (two physical + 1 logical), for a total of 8TB Leave the RAID1 array as it is, make another RAID1 of the 4TB disks, then a RAID0 of the two logical volumes (2TB + 4TB) for a total of 6TB (mdadm does not waste space with RAID0s made from different sizes); Leave the RAID1 array as it is, make another RAID1 of the 4TB disks, then use L (HowTos)