are drbd and 2 node clusters still things in the age of distributed storage?

[pixel]

Was looking through the table of contents in Mr. Chengs new book on HA, and saw a lot of discussion of drbd. i thought drbd would be dead by now. we have ceph and glusterfs.

• it is apparently hard to get it right. lots of moving parts, lots of potential for mistakes.
• it does not scale out. if you run out of space, make a new one.
• ceph and glusterfs are much easier to set up, and to do it right
• ceph has that briliant monitor system for HA integrity

in other words, why would you work harder for something less expandable and versatile?

also, 3 node cluster are much easier than 2 node. a dummy quorum box is cheap. is 2 node HA at all still a thing?

 

[udo]

Was looking through the table of contents in Mr. Chengs new book on HA, and saw a lot of discussion of drbd. i thought drbd would be dead by now. we have ceph and glusterfs.

• it is apparently hard to get it right. lots of moving parts, lots of potential for mistakes.
• it does not scale out. if you run out of space, make a new one.
• ceph and glusterfs are much easier to set up, and to do it right
• ceph has that briliant monitor system for HA integrity

in other words, why would you work harder for something less expandable and versatile?

also, 3 node cluster are much easier than 2 node. a dummy quorum box is cheap. is 2 node HA at all still a thing?

Hi,
I don't use 2-Node Cluster but drbd and ceph.

drbd is much faster than ceph (much less latency). I use drbd with SAS-Raid10 + SSD volumes between 2*2 nodes in one cluster. Much less trouble with drbd like with ceph!

I don't want miss DRBD or Ceph - they have both their advantage.

Udo

 

[mo_]

I find people tend to shy away from the complecity and harsh limitations of DRBD in favour of better scaling and better automated storage solutions like ceph or multi-node database clusters (instead of master-slave DRBD/heartbeat replicated mysql setups). Its not that DRBD wouldnt be usable (for some small corner use case), but it's mostly a case of "why bother".