Gluster on top of RAID5

andrea68

Renowned Member
Jun 30, 2010
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I was thinking to save disk and avoid 3 replication Gluster waste of space, to create a gluster distributed volume (with no redundancy) on top on Raid5 hardware hotswappable on 3 nodes.

It is a viable solution or a very bad scenario?

Tnx in advance...!!!
 
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Just for a thought, what happens if one node dies completely? I assume, then that portion of the data is not available and I guess the VM/CT using that data will fail.
 
Just for a thought, what happens if one node dies completely? I assume, then that portion of the data is not available and I guess the VM/CT using that data will fail.

Yes, you are right.
Obviously the 3 nodes will be redundant in every other aspect to avoid or minimize fails.
But if a stop of services are allowed, data are safe in raid5 so you can recover from a node fail simply restarting it o reinstalling it.
This is good only on a small home project or where there's no SLA etc.

I think at this solution looking gluster docs:

https://docs.gluster.org/en/latest/Administrator Guide/Setting Up Volumes/

"You can use distributed volumes where the requirement is to scale storage and the redundancy is either not important or is provided by other hardware/software layers"...

If someone has another interesting solution with 3 nodes, local storage and Gluster (or Ceph) without losing 2/3 of disk space and have a decency avaibility, I'm all ears :D
 
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Hi,


If someone has another interesting solution with 3 nodes, local storage and Gluster or Ceph without losing 2/3 of disk space and have a decency avaibility, I'm all ears

Maybe it will be better to use lizardFS. Using something like RAID5(lizardfs) you will lose only 1/3 of disk space!