How different are RAID 5, RAID 6 and RAID 10?

[ohbus]

Can we do apples to apples comparison of RAID 5, RAID 6 and RAID 10?

 

I'm a noob to this, It will be better if members here are little comprehensive.

 

Thank you.

[Helly]

RAID-5 uses a parity drive to calculate the contents of the rest of the drives. The space available to you in the end is Number of drives - 1. So 5x 1TB gives you 4TB space.

 

RAID-10 uses 2 RAID-1 volumes and puts those in RAID-0. The space available is half and you always need an even number of drives. So 6x 1TB gives you 3TB of space.

 

RAID-5 can survive losing 1 drive max.

RAID-10 can survive losing 1 drive in each volume, losing 2 drives in the same volume makes you lose everything.

 

Just for completion. RAID-6 is the same as RAID-5. Except 6 has 2 parity drives and thus the space available is number of drives - 2. so 5x 1TB gives you 3TB of space. RAID-6 can however survive any 2 drives dying.

[ohbus]

9 minutes ago, Helly said:

RAID-5 uses a parity drive to calculate the contents of the rest of the drives. The space available to you in the end is Number of drives - 1. So 5x 1TB gives you 4TB space.

 

RAID-10 uses 2 RAID-1 volumes and puts those in RAID-0. The space available is half and you always need an even number of drives. So 6x 1TB gives you 3TB of space.

 

RAID-5 can survive losing 1 drive max.

RAID-10 can survive losing 1 drive in each volume, losing 2 drives in the same volume makes you lose everything.

 

Just for completion. RAID-6 is the same as RAID-5. Except 6 has 2 parity drives and thus the space available is number of drives - 2. so 5x 1TB gives you 3TB of space. RAID-6 can however survive any 2 drives dying.

Thanks a ton for helping me clarify.

[seagate_surfer]

Play around with different RAID configurations using the Synology RAID Calculator tool. It has helped me visualize different potential implementations quite a bit. Unless you've got a Synology NAS, ignore the SHR categories, these are specific to their enclosures.