On 2013-04-22, Mattieu Baptiste <mattie...@gmail.com> wrote: > Hi, > > I'm currently trying to access files from my OpenBSD -current/amd64 > workstation on a NAS under FreeNAS (8.3.1). On my workstation, the > filesystem is a read/write NFS mounted share. Its size is about 5.2TB. > While reading seems normal : about 45MB/s, writing is a lot slower > (fluctuates between 10MB/s and 20MB/s) before eventually stall (under > 1MB/s). Note that at the start, my box is totally unresponsive. When the > writes fall below 1MB/s, the box became responsive again.
I had a lot of problems with NFS writes dragging the client to a halt with NFSv3 on *some* systems which were greatly improved by switching to NFSv2. On the other hand, other machines were perfectly OK with it... NFSv2 has other problems, not least a big write amplification effect when NFS and disk block sizes don't match (at least with OpenBSD as a server), also it limits files to 2GB which makes it unusable in some situations, but it might be worth a try to see if the problem remains.
