2018-02-21 19:26 GMT+01:00 Daniel Carrasco <[email protected]>:
> Hello,
>
> I've created a Ceph cluster with 3 nodes to serve files to an high traffic
> webpage. I've configured two MDS as active and one as standby, but after
> add the new system to production I've noticed that MDS are not balanced and
> one server get the most of clients petitions (One MDS about 700 or less vs
> 4.000 or more the other).
>
> Is possible to make a better distribution on the MDS load of both nodes?.
> Is posible to set all nodes as Active without problems?
>
> I know that is possible to set max_mds to 3 and all will be active, but I
> want to know what happen if one node goes down for example, or if there are
> another side effects.
>
>
> My last question is if someone can recomend me a good client configuration
> like cache size, and maybe something to lower the metadata servers load.
>
>
> Thanks!!
>
I forgot to say my configuration xD.
I've a three nodes cluster with AIO:
- 3 Monitors
- 3 OSD
- 3 MDS (2 actives and one standby)
- 3 MGR (1 active)
The data has 3 copies, so is in every node.
My configuration file is:
[global]
fsid = BlahBlahBlah
mon_initial_members = fs-01, fs-02, fs-03
mon_host = 192.168.4.199,192.168.4.200,192.168.4.201
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
public network = 192.168.4.0/24
osd pool default size = 3
##
### OSD
##
[osd]
osd_pool_default_pg_num = 128
osd_pool_default_pgp_num = 128
osd_pool_default_size = 3
osd_pool_default_min_size = 2
osd_mon_heartbeat_interval = 5
osd_mon_report_interval_max = 10
osd_heartbeat_grace = 15
osd_fast_fail_on_connection_refused = True
##
### MON
##
[mon]
mon_osd_min_down_reporters = 2
##
### MDS
##
[mds]
mds_cache_size = 250000
mds_cache_memory_limit = 792723456
##
### Client
##
[client]
client_cache_size = 32768
client_mount_timeout = 30
client_oc_max_objects = 2000
client_oc_size = 629145600
rbd_cache = true
rbd_cache_size = 671088640
Thanks!!!
--
_________________________________________
Daniel Carrasco Marín
Ingeniería para la Innovación i2TIC, S.L.
Tlf: +34 911 12 32 84 Ext: 223
www.i2tic.com
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