[ceph-users] Re: CephFS clients waiting for lock when one of them goes slow

2020-08-14 Thread Yan, Zheng
On Sat, Aug 15, 2020 at 12:32 AM wrote: > > Yes, I've seen this problem quite frequently as of late, running v13.2.10 > MDS. It seems to be dependent on the client behavior - a lot of xlock > contention on some directory, although it's hard to pin down which client is > doing what. The only rem

[ceph-users] Re: CephFS clients waiting for lock when one of them goes slow

2020-08-14 Thread pchoi
Yes, I've seen this problem quite frequently as of late, running v13.2.10 MDS. It seems to be dependent on the client behavior - a lot of xlock contention on some directory, although it's hard to pin down which client is doing what. The only remedy was to fail over the MDS. 1k - 4k clients 2M r

[ceph-users] Re: CephFS clients waiting for lock when one of them goes slow

2020-08-14 Thread Eugen Block
Hi, 1,5 GB MDS cache for 20 clients is not enough, I would start with increasing that to 4 or 8 GB and see if the problems still occur. Regards, Eugen Zitat von Petr Belyaev : Hi all, I have a very small Ceph setup - 3 OSDs, 3 MDS, 3 MON, CephFS with ~20 ceph-fuse clients connected. Al