RAID 5 vs RAID 10
I just want to be sure I understand the difference between RAID 5 and RAID 10. I have a server where my main concern is to increase storage. I have 6 drive slots available to me. I am going to replace the current drives with 6 1TB disks. If I use RAID 5 I will have a logical 4TB disk with 1 hotswap and 1 parity disk. If I use RAID 10 the most I would get out of these drives is 2TB (3 mirrored drives). I know RAID 10 allows for better performance but is there any way to increase that capacity?
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The bay that these disks are in actually has 8 slots. Two are RAID1 for the OS already. I am not touching that. So the remaining 6 were what was in question. While I lose 1TB of storage going with RAID10 I think I am better off with the performance. Thanks for the quick refresher course.
So what you want to do is create a 2 x 1 TB drive pair as a RAID1 for the O/S. Then take the 4 remaining drives and make it a RAID10. If you have 2 more slots then many RAID controllers will allow you to resilver the 4-disk RAID10 into a 6-disk RAID10, but you need the bays.
Exactly what controller do you have, what is your O/S, and please check the manual for your computer and see if it can boot a disk > 2TB before you even worry about building a 6-drive RAID5.