> On Sep 25, 2019, at 9:48 AM, bfields@xxxxxxxxxxxx wrote: > > On Wed, Sep 18, 2019 at 06:36:13PM -0500, Kevin Vasko wrote: >> We have a new Dell EMC Unity 300 acting as NAS Server that is >> presenting a NFSv4 NFS Share. Our clients are mostly Ubuntu 18.04.3 >> but issue is also present on CentOS 7.6 systems. We have been >> struggling with this issue for over a week now and not sure how to >> resolve it. >> >> >> >> We are having trouble with NFS Clients completing their writes to the >> Dell EMC Unity 300 NFS Server when Kerberos is enabled on the NFS >> Share. I created the NFS Share on the U300, associated it with our >> FreeIPA (Kerberos/LDAP server) and everything shows successful. > > Troubleshooting ideas off the top of my head: > > It might be worth trying some other client versions if it's not hard. > > It'd be interesting to know what's happening on the network.... > Unfortunately big krb5p writes won't be fun to try to capture and > examine. Wireshark is supposed to have a mechanism for giving it the keys so that captured GSS data can be decrypted. I've never gotten it to work, but I didn't try hard. Should be appropriately documented. > Maybe some network or rpc-level statistics would help show if > there are an unusual number of retries or failures. -- Chuck Lever
