question about CEPH OSDs

[Ronny]

Hello,

it is possible to use different size and/ or different count of OSDs (Disks) per CEPH Node?

example ceph config, every disk have 1TB size

Node 1, 1HE hight, all 8 Slots full for CEPH
Node 2, 1HE hight, all 8 Slots full for CEPH
Node 3, 1HE hight, all 8 Slots full for CEPH

Node 4, 2HE hight, 8 Slots of 24 for CEPH
Node 5, 2HE hight, 8 Slots of 24 for CEPH
Node 6, 2HE hight, 8 Slots of 24 for CEPH

how can i:

A) add more disks to the 2 HE Nodes?
B) add biger disks (2TB)?


if i understand the ceph data organisation correctly the Nodes with lower disk count or disk size become faster full disks.


who can help me?

thanks a lot

regards
Ronny

 

[itNGO]

Hi,
you can configure weight and balancing rules in Ceph.
But this can only be done in CLI not with the GUI/Web-Interface.
So it is possible to have mixed size disks and different amount of OSDs per Host.

 

[Ronny]

wow, cool.

do you have any examples for me?
What should I pay attention if i will mix it?

regards
Ronny

 

[czechsys]

ceph documentation