Pre-Sales Questions about Growing RAID Volumes
I have a Drobo 5D which I am looking to migrate away from, I currently have about 3Ti of data on it. I was looking at some of your products and have a couple of questions that I hope you can help me with, I've had the documentation but too be honest aren't entirely sure of the answers….
My data is media files (audio and video) and is basically a media vault - I don’t do any video editing etc. but I can expect slow but steady growth in the data volume I need to store. I was looking at either RAID 1, 1+0 or RAID 5 but I would like to know what options I would have for growth with these - with my Drobo I just replace a disk with a large one and the available storage increases, but with traditional RAID that isn’t quite the case.
With RAID 1 can I simply swap out both of the mirror disks (one at a time) for larger ones and then grow the volume?
With RAID 1+0 can I swap out as with RAID 0? Can I add additional disk to each mirrored stripe and grow that way?
With RAID 5 can I replace all the disks with larger ones and then grow the volume?
A volume that has redundancy can be resized larger, if all the disks have been replaced with o=larger ones, yes.
Its the equivalent of making a smaller volume than the max on disks, then resizing it later on.
We do not support Drobo style RAID where all the volume disk partitions are different sizes.
Thanks! What about growing RAID 1+0 by adding a pair of additional disks, is that possible?
Sorry, no, because that would require moving all that data around. We do not want to do that, when we do not "own" the enclosures, they are generic. Maybe someday but the level of testing we would have to do to support that is immense, as it is user's data that we are touching. (and users can buy some cruddy hardware!)
Ok, then to summarise....
1) I can grow a RAID 1 by replacing all the disks with larger (one at a time) and then growing the volumes
2) I can grow a RAID4/5 by doing the same
Any other RAID level I have no growth option - correct?
Technically, RAID 1+0 you can replace all drives also, and expand.
Thank you, this has been really helpful.