[email protected] said: > I'm initiating a copy of the tree from the client by doing a good 'ol: > # cd /mnt/path > # tar cf - . | (cd /path/dst ; tar xvf -) > I'm only getting around 200MB/sec (~1.6Gbps). Does this sound like an > expected ceiling?
Please accept my apologies if this seems too obvious, or if you've already been down this road: Do your R720's have any kind of NVRAM cache in effect for the ZFS pools? E.g. an H800 RAID controller, or a separate ZFS log device (a.k.a. "dedicated ZIL" device)? Without one of the above, the "tar xvf" workload over NFS is going to be hit by the synchronous write delays (and subsequent ZFS cache flushes) for each and every directory creation, etc. The performance penalty can be huge, especially when un-tar-ing lots of tiny files, directories, and subdirectories. You might test if this is what's going on by temporarily disabling the ZIL on your NFS servers. I believe "zfs set sync=disabled" will do the trick when applied to the dataset(s) involved. And/or, use "zilstat" to watch ZIL traffic before/during/after your tests. Regards, Marion _______________________________________________ nfs-discuss mailing list [email protected]
