Hello Javier >>> Did you try disabling nfs.v4.read_delegation? >>> >> No, since we only recently changed from NFSv3 to NFSv4 and with v3 were >> using mount option nocto on 99% of the mounts for performance. We have >> currently no idea what implications we would have if we turn off read >> delegation. >> Is there any way to estimate/measure the performance improvements achieved >> by using read delegation as in our current setup? >I have no idea, I'm suggesting such solution because that is the >response on Redhat customer portal (I'm not sure what could I post >from that response, I have a account there)) >(https://access.redhat.com/solutions/728943)
Disabled read delegation on Sunday - had to reenable it now since the NetApp NFS server was doing 150% more NFS operations than before and the CPU was going over our limits. So we might just live with that warning then. Strange though: NFSv4 is now around 12 years old and still not properly implemented on the clients as it seems... Best regards Rainer