I had to reply to this even though it is old because I was trying to find a data storage solution for our small office needs using RAID and it took me a long time to figure out you can use any amount of drives, and get as many copies as you want with software MDADM RAID10 (OK, I think there is a max number of drives). RAID10 with odd number of drives is similar to RAID1E Only advantage is increased redundancy and writes will be slover. RAID1 with 3 drives seems to me like waste of money. With RAID5 is definitely no go with SW raid -> additional costs. Somebody mentioned that even with 2 drives is better to use RAID10 because its reading from both drives at once what RAID1 is not. RAID5 with 3 disks - 2TB usable spaceĪs I already mentioned - performance is the important for me. Problem is that I have only 3 hotswap positions for HDD in server. Regarding HW vs SW Raid - i think RAID5 one should definitely go with HW, but with RAID1/RAID10 its not so clear to see performance difference and the configuration is so easy under linux. I did test RAID10 i vmware with 3x8GB virtual hdd.
RAID10 implementation in linux mdadm make it possible on odd number of drives.
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