Switching to XCP-NG, want to hear your problems

flakpyro

@CodeMercenary I am using V4 on the XO-Server to our backup remotes and it seems to work just fine. However using V4 as a storage SR was nothing but problems, as @nikade mentioned we had tons of NFS Server not responding issues which would lock up hosts and VMs causing downtime. Since moving to v3 that hasn't happened.

Checking a host's NFS retransmissions stats after 9 days of uptime i see we have had some retransmissions but they have not caused any downtime or even any timeout messages to appear in dmesg on the host.

[xcpng-prd-02 ~]# nfsstat -rc
Client rpc stats:
calls      retrans    authrefrsh
268513028   169        268537542

From what a gather from this blog post from redhat (https://www.redhat.com/sysadmin/using-nfsstat-nfsiostat) it seems like that amount of retransmissions is VERY low and not an issue.

nikade

@flakpyro said in Switching to XCP-NG, want to hear your problems:

@CodeMercenary I am using V4 on the XO-Server to our backup remotes and it seems to work just fine. However using V4 as a storage SR was nothing but problems, as @nikade mentioned we had tons of NFS Server not responding issues which would lock up hosts and VMs causing downtime. Since moving to v3 that hasn't happened.

Checking a host's NFS retransmissions stats after 9 days of uptime i see we have had some retransmissions but they have not caused any downtime or even any timeout messages to appear in dmesg on the host.
[xcpng-prd-02 ~]# nfsstat -rc
Client rpc stats:
calls      retrans    authrefrsh
268513028   169        268537542
From what a gather from this blog post from redhat (https://www.redhat.com/sysadmin/using-nfsstat-nfsiostat) it seems like that amount of retransmissions is VERY low and not an issue.

Thats fine, we've got a lot more and I haven't seen any "nfs server not responding" in dmesg yet.
Using NFS v3 for both SR and backups now for a couple of years and it's been great, I think I had issues once or twice in like 5-6 years on the backup SR where the vhd file got locked by dom0, Vates helped out there as always and it was resolved quickly.