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ReadyNAS RN42200 hangs completely up during backup to RN31400
Hi everyone, I am trying now since already a year to do backups from my newer RN42200 (two 12TB Disks in RAID 1) to my older RN31400 (4 Disks, RAID 5). Both are on OS 6.10.3. I tried Backups via SMB,...
Hi Stephen, I think the MTU size (at 9000) was the root cause! After changing it on both boxes back to 1500 and a reboot everything worked. I successfully tried via NFS, SMB and Rsync.
But first I had to delete the existing backup-jobs and had to create new ones. The old ones were not working! Whyever...
Wow, this is really absolutely unexpected. Strange, because from all other devices on the network it was always working! No matter which OS, Windows as well as Linux.
However, many thanks Stephen for your help and especially also for your patience which I really appreciate. May be I get ometimes to opportunity to help you too!!!:smileyvery-happy:
Worli wrote:
Stephen, on both boxes the 127.0.0.1-test was successful. I Rsynced locally from Share Music to Share temp2. 15GB within a minimum of time.
That suggests there might be something going on with your network. Anything on the path that might be blocking ports? Are you using the standard ethernet MTU, or have you configured jumbo frames?
How comfortable are you with ssh?
Hi Stephen, I think the MTU size (at 9000) was the root cause! After changing it on both boxes back to 1500 and a reboot everything worked. I successfully tried via NFS, SMB and Rsync.
But first I had to delete the existing backup-jobs and had to create new ones. The old ones were not working! Whyever...
Wow, this is really absolutely unexpected. Strange, because from all other devices on the network it was always working! No matter which OS, Windows as well as Linux.
However, many thanks Stephen for your help and especially also for your patience which I really appreciate. May be I get ometimes to opportunity to help you too!!!:smileyvery-happy:
Worli wrote:
Hi Stephen, I think the MTU size (at 9000) was the root cause! After changing it on both boxes back to 1500 and a reboot everything worked. I successfully tried via NFS, SMB and Rsync.
Wow, this is really absolutely unexpected.
Great! If you want to probe further, you could re-enable the jumbo frames, and then probe the path MTU between the NAS with ping (using the option to block packet fragmentation). My guess is that there's a switch on the path that doesn't support ethernet frames this large (though it might still support jumbo frames with a somewhat smaller MTU).
Or leave well enough alone. Jumbo frames don't always help performance - the main benefit is that they reduce the packets-per-second processing in the ethernet clients, which can reduce their CPU load. It doesn't matter much to the network itself - the overhead savings are inconsequential.
Worli wrote:
However, many thanks Stephen for your help
I'm happy to help, and I'm glad you got it figured out.
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