Hi ,
I've do that before and when I try to write file into rbd. It's get
freeze.
Beside resource, is there any other reason not recommend to combined mon
and osd?
Best wishes,
Mika
2015-08-18 15:52 GMT+08:00 Межов Игорь Александрович me...@yuterra.ru:
Hi!
You can run mons on the same hosts, though it is not recommemned. MON
daemon
itself are not resurce hungry - 1-2 cores and 2-4 Gb RAM is enough in most
small
installs. But there are some pitfalls:
- MONs use LevelDB as a backstorage, and widely use direct write to ensure
DB consistency.
So, if MON daemon coexits with OSDs not only on the same host, but on the
same
volume/disk/controller - it will severily reduce disk io available to OSD,
thus greatly
reduce overall performance. Moving MONs root to separate spindle, or
better - separate SSD
will keep MONs running fine with OSDs at the same host.
- When cluster is in healthy state, MONs are not resource consuming, but
when cluster
in changing state (adding/removing OSDs, backfiling, etc) the CPU and
memory usage
for MON can raise significantly.
And yes, in small cluster, it is not alaways possible to get 3 separate
hosts for MONs only.
Megov Igor
CIO, Yuterra
--
*От:* ceph-users ceph-users-boun...@lists.ceph.com от имени Luis
Periquito periqu...@gmail.com
*Отправлено:* 17 августа 2015 г. 17:09
*Кому:* Kris Vaes
*Копия:* ceph-users@lists.ceph.com
*Тема:* Re: [ceph-users] Question
yes. The issue is resource sharing as usual: the MONs will use disk I/O,
memory and CPU. If the cluster is small (test?) then there's no problem in
using the same disks. If the cluster starts to get bigger you may want to
dedicate resources (e.g. the disk for the MONs isn't used by an OSD). If
the cluster is big enough you may want to dedicate a node for being a MON.
On Mon, Aug 17, 2015 at 2:56 PM, Kris Vaes k...@s3s.eu wrote:
Hi,
Maybe this seems like a strange question but i could not find this info
in the docs , i have following question,
For the ceph cluster you need osd daemons and monitor daemons,
On a host you can run several osd daemons (best one per drive as read in
the docs) on one host
But now my question can you run on the same host where you run already
some osd daemons the monitor daemon
Is this possible and what are the implications of doing this
Met Vriendelijke Groeten
Cordialement
Kind Regards
Cordialmente
С приятелски поздрави
This message (including any attachments) may be privileged or
confidential. If you have received it by mistake, please notify the sender
by return e-mail and delete this message from your system. Any unauthorized
use or dissemination of this message in whole or in part is strictly
prohibited. S3S rejects any liability for the improper, incomplete or
delayed transmission of the information contained in this message, as well
as for damages resulting from this e-mail message. S3S cannot guarantee
that the message received by you has not been intercepted by third parties
and/or manipulated by computer programs used to transmit messages and
viruses.
___
ceph-users mailing list
ceph-users@lists.ceph.com
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
___
ceph-users mailing list
ceph-users@lists.ceph.com
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
___
ceph-users mailing list
ceph-users@lists.ceph.com
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
