As others have mentioned, there is no reason you cannot run databases on
Ceph storage. I've been running/testing Postgres and Mysql/Mariadb on
Ceph RDB volumes for quite a while now - since version 0.50 (typically
inside KVM containers but via the kernel driver will work too).
With a reasonable number of OSD + SSD for journals pretty good
performance should be possible. However you may see some asymmetry in
this performance - fast random and sequential writes, fast random reads
but considerably slower sequential reads. The RBD cache may help here,
but I need to investigate this further (and also some of the more fiddly
settings to do with vertio disk config).
Regards
Mark
On 04/04/14 07:04, Brian Beverage wrote:
I am looking at setting up a Ganeti cluster using KVM and CentOS. While
looking at storage I first looked at Gluster but noticed in the
documentation it does not allow Live Database files to be saved to it.
Does Ceph allow the use of LIVE database files being saved to it. If so
does the database perform well? We have a couple Database servers that
will be virtualized. I would like to know what other Ceph users are
doing with their virtual environments that contain databases. I do not
want to be locked into a SAN. I also would like to do this without being
locked into a proprietary VM software. That is why Ganeti and KVM was
the preferred software.
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