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Hi, We plan to reactivate barrier. The solution is to add lots of RAM for MySQL innodb_buffer_pool_size. I guess you're right, 10GB with 20 SSDs maybe not enough. Thanks to all of you guys :)

Activating mysql binary logs and keep ext4 nobarrier could be safe enough ?

Hi, Yes benchmarks are done. Results are almost similar to what Proxmox team did. Benchmarking now with 40 vms on production could be irrelevant. Mysql instances perform about 500 to 1000 queries/sec each. If nothing could be done, no choice I must settle barrier=1 and keep writeback for vm...

Hi, I noticed that the only way to get low iowaits with ceph is to settle VM disk cache to writeback. But it's not enough, with mysql (innodb) we still have high iowaits on high load. We have to disable barrier on ext4 mount options. After that, disk performance is OK. On a 5 nodes cluster...

Hi, Reboot node was mandatory to fix the issue. I deplore that lxc is so shitty. Ok there is no overhead compared to kvm but there are lot of limitations (live migrate first of all, until recently nfs/cifs mounts...). IMHO if you want containers you'd better use swarm/kubernetes. (inside a...

Thanks, I tried but ip link delete veth50011i0@if35 Error: argument "veth50011i0@if35" is wrong: "dev" not a valid ifname

Is there a way to shutdown 50011 veth interfaces ? ip a | grep 50011 36: veth50011i0@if35: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0v50 state UP group default qlen 1000 38: veth50011i1@if37: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0v193...

Hi, Done. but it's still responding to ping :/

I also forgot to mention that the root storage (ceph) is available

Is the 17754 pid the right one to kill ?

Hi, I first tried to shutdown the container but it returned a timeout (60s). Then tried to stop but also failed. pct list VMID Status Lock Name 50011 running dc-btsip-01 So I decided to kill the related lxc process but wasn't been able to find it ...

Hi, Yes it does. I suggest to keep guest-fsfreeze in order to have consistent backups. Mandatory for SQL databases. I use it to backup a ZFS disk for my SQL Server 2016 (every 2 hours). It locks FS only 2 or 3 seconds. If it's not the point, you could create your own scripts...

Thanks, Do you plan to add some kind of check boxes to add these flags (or maybe via datacenter cfg file) ? Antoine

Hi, On a small cluster, I have 2 different CPU model for nodes, one is Broadwell, the others are Haswell. I usually set the CPU VM as 'host'. Indeed, live migrations works as expected from Haswell to Haswell and Haswell to Broadwell. But it crashes from Broadwell to Haswell, some flags are not...

Hi everyone, I put the node online early this morning. Everything is working as expected. :) Indeed, Ceph re-balanced datas on OSDs.