Re: [ceph-users] when an osd is started up, IO will be blocked

2015-10-27 Thread Jevon Qiao
Hi Cephers, We're in the middle of trying to triage the issue with ceph cluster running 0.80.9 which was reported by Songbo and seeking for you experts' advices. In fact, per our testing the process of stopping an working OSD and starting it again will lead to a huge performance downgrade. I

[ceph-users] Change MDS's mode from active to standby

2016-05-01 Thread Jevon Qiao
Hi, Currently, I'm testing the functionality of multiple MDS in Jewel 10.2.0. I know increasing the value of max_mds can make the standby MDS become active(I have two MDSes and max_mds=1). But I'm wondering if there is a way to change the mode back. I tried to decrease max_mds, but it did not

[ceph-users] Any suggestion to deal with slow request?

2016-01-06 Thread Jevon Qiao
Hi Cephers, We have a Ceph cluster running 0.80.9, which consists of 36 OSDs with 3 replicas. Recently, some OSDs keep reporting slow request and the cluster has a performance downgrade. From the log of one OSD, I observe that all the slow requests are resulted from waiting for the replicas

Re: [ceph-users] Any suggestion to deal with slow request?

2016-01-07 Thread Jevon Qiao
be helpful. - Robert LeBlanc PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 On Wed, Jan 6, 2016 at 9:03 PM, Jevon Qiao wrote: Hi Cephers, We have a Ceph cluster running 0.80.9, which consists of 36 OSDs with 3 replicas. Recently, some OSDs keep reporting slow r