There is 1 more thing that I noticed when using cephfs instead of RBD for
MySQL, and that is CPU usage on the client.
When using RBD, I was using 99% of the CPU’s. When I switched to cephfs, the
same tests were using 60% of the CPU. Performance was about equal. This test
was an OLTP sysbench usi
On Mon, May 1, 2017 at 9:17 AM, Babu Shanmugam wrote:
>
> My intention is to just identify the root cause for the too much time spent
> on a "table create" operation on CephFS. I am *not* trying to benchmark with
> my testing. Sorry if it wasn't clear in my mail.
>
> I am sure the time spent wou
My intention is to just identify the root cause for the too much time
spent on a "table create" operation on CephFS. I am *not* trying to
benchmark with my testing. Sorry if it wasn't clear in my mail.
I am sure the time spent would be lesser if I had a proper CEPH setup.
But, I believe even t
I'm by no means a Ceph expert but I feel this is not a fair representation
of Ceph, I am not saying numbers would be better or worse. Just the fact I
see some major holes that don't represent a typical Ceph setup.
1 Mon? Most have a minimum of 3
1 OSD? basically all your reads and writes are going
On Monday 01 May 2017 10:24 AM, David Turner wrote:
You don't have results that include the added network latency of
having replica 3 replicating across multiple hosts. The reads would be
very similar as the primary is the only thing that is read from, but
writes will not return until after
You don't have results that include the added network latency of having
replica 3 replicating across multiple hosts. The reads would be very
similar as the primary is the only thing that is read from, but writes will
not return until after all 3 copies are written.
On Sat, Apr 29, 2017, 9:46 PM Ba
Hi,
I did some basic experiments with mysql and measured the time taken by a
set of operations on CephFS and RBD. The RBD measurements are taken on a
1GB RBD disk with ext4 filesystem. Following are my observation. The
time listed below are in seconds.
*Plain file system* *CephFS
