11 Jan
2017
11 Jan
'17
3:40 a.m.
Doug McIlroy <doug(a)cs.dartmouth.edu> wrote:
And, sadly, NFS is still with us, having somehow
upstaged Peter
Weinberger's RFS (R for remote) that appeared at the same time.
NFS allows one to add computers to a file system, but not to
combine the file systems of multiple computers, as RFS did
by mapping uids: NFS:RFS::LAN:WAN.
This changed long ago, NFSv4 no longer sends uid's but user names and supports
mappings.
NFS won because it was not built on top of UNIX semantics and thus allowed to
port it to other platforms.
The nice idea in RFS was that it supported remote devices, but the iotcl
handling was a problem in AT&T UNIX before SVr4 ??? added a flag to tell
whether the data source was in kernel or userland. I am not sure wether RFS
had a concept like XDR for ioctls.
The funny thing: RFS was supported in SunOS4, but not in SunOS-5.
Jörg
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