Public network is clients-to-OSD traffic - and if you have NOT explicitely defined cluster network, than also OSD-to-OSD replication takes place over same network.
Otherwise, you can define public and cluster(private) network - so OSD replication will happen over dedicated NICs (cluster network) and thus speed up.
If i.e. replica count on pool is 3, that means, each 1GB of data writen to some particualr OSD, will generate 3 x 1GB of more writes, to the replicas... - which ideally will take place over separate NICs to speed up things...
On 14 March 2015 at 17:43, Georgios Dimitrakakis <giorgis@xxxxxxxxxxxx> wrote:
Hi all!!
What is the meaning of public_network in ceph.conf?
Is it the network that OSDs are talking and transferring data?
I have two nodes with two IP addresses each. One for internal network 192.168.1.0/24
and one external 15.12.6.*
I see the following in my logs:
osd.0 is down since epoch 2204, last address 15.12.6.21:6826/33094
osd.1 is down since epoch 2206, last address 15.12.6.21:6817/32463
osd.2 is down since epoch 2198, last address 15.12.6.21:6843/34921
osd.3 is down since epoch 2200, last address 15.12.6.21:6838/34208
osd.4 is down since epoch 2202, last address 15.12.6.21:6831/33610
osd.5 is down since epoch 2194, last address 15.12.6.21:6858/35948
osd.7 is down since epoch 2192, last address 15.12.6.21:6871/36720
osd.8 is down since epoch 2196, last address 15.12.6.21:6855/35354
I 've managed to add a second node and during rebalancing I see that data is transfered through
the internal 192.* but the external link is also saturated!
What is being transferred from that?
Any help much appreciated!
Regards,
George
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