Re: [ceph-users] Distribution of performance under load.

2013-10-18 Thread Wido den Hollander
On 10/17/2013 11:03 PM, Gregory Farnum wrote: On Thu, Oct 17, 2013 at 6:19 AM, Robert van Leeuwen wrote: Hi, I'm wondering how Ceph behaves when there are multiple sources writing heavily to the same pool (e.g. Openstack nova compute) Will each get its own "fair share" or will a very heavy us

Re: [ceph-users] Distribution of performance under load.

2013-10-17 Thread Gregory Farnum
On Thu, Oct 17, 2013 at 6:19 AM, Robert van Leeuwen wrote: > Hi, > > I'm wondering how Ceph behaves when there are multiple sources writing > heavily to the same pool (e.g. Openstack nova compute) > Will each get its own "fair share" or will a very heavy user impact all > others? Ceph doesn't d

[ceph-users] Distribution of performance under load.

2013-10-17 Thread Robert van Leeuwen
Hi, I'm wondering how Ceph behaves when there are multiple sources writing heavily to the same pool (e.g. Openstack nova compute) Will each get its own "fair share" or will a very heavy user impact all others? Are there ways to tune this? (Openstack Havana has added QoS so this somewhat reduces a