Imagine you got a host with 60 Spinning Disks -> I would recommend you to split it to 10/12 disk groups and these groups will represent several bricks (6/5).

Keep in mind that when you start using many (some articles state hundreds , but no exact number was given) bricks , you should consider brick multiplexing (cluster.brick-multiplex).

So, you can use as many bricks you want , but each brick requires cpu time (separate thread) , tcp port number and memory.

In my setup I use multiple bricks in order to spread the load via LACP over several small (1GBE) NICs.


The only "limitation" is to have your data on separate hosts , so when you create the volume it is extremely advisable that you follow this model:

hostA:/path/to/brick
hostB:/path/to/brick
hostC:/path/to/brick
hostA:/path/to/brick2
hostB:/path/to/brick2
hostC:/path/to/brick2

In JBOD mode, Red Hat support only 'replica 3' volumes - just to keep that in mind.

From my perspective , JBOD is suitable for NVMEs/SSDs while spinning disks should be in a raid of some type (maybe RAID10 for perf).


Best Regards,
Strahil Nikolov






В сряда, 14 октомври 2020 г., 06:34:17 Гринуич+3, C Williams <cwilliams3320@gmail.com> написа:





Hello,

I am getting some questions from others on my team.

I have some hosts that could provide up to 6 JBOD disks for oVirt data (not arbiter) bricks 

Would this be workable / advisable ?  I'm under the impression there should not be more than 1 data brick per HCI host .

Please correct me if I'm wrong.

Thank You For Your Help !


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