On Apr 10, 2006, at 3:26 PM, dima wrote:
First, searching through the archives I'm about to say "No".
My goal is to provide NFS service to many FreeBSD clients sharing
the exports. The usage pattern appears to be "many reads and not as
much writes". The deployment might look like the following: a SAN
and 2 NFS servers sharing its LUNs. The servers use hot-standby
scheme provided by CARP (or its equivalent). Many FreeBSD clients
would share their exports. I wish servers ran FreeBSD also since
it's the best known OS for the company administrators.
The NFS protocol is stateless, but most clients doing writes will use
a locking mechanism which is not stateless. In other words, you can
easily cluster read-only NFS shares, but this is not true of read-
write shares.
The majors are:
- no data corruption
- no hangs (this seems to be the largest problem with current
implementation)
- client retry on failure
These two suggest you might be happier with Samba/CIFS.
- a reasonable read speed
My questions:
1. NFS/UDP (it's stateless!) is considered to be "evil". Why
(assuming I can grant a balanced network bandwidth)?
Dunno, NFS over UDP works just fine.
2. NFS server implementation seems to be very buggy. Any success
stories? Well, NFS servers can easily run Linux, Solaris etc.
NFS works reasonably well on FreeBSD, modulo rpc.lockd. Solaris
probably has the best NFS implementation available, and would be a
better fileserver platform than almost anything else you've
mentioned. NFS on Linux is probably more buggy than NFS on FreeBSD,
from what I've seen.
3. Is at least implementation of NFS client (either kernel-side or
user-space) stable enough for production use? Client OS replacement
is impossible (hardly suitable, really) in my project.
NFS on FreeBSD is stable but perhaps not bullet-proof.
PS: The competing options are either SMB or CODA for now. Any other
suggestions?
PPS: I'd be happy to hear that FreeBSD supports at least one really
clustered FS (proprietary ones are also OK). But I think I wouldn't :(
I think you can get some amount of the Veritas suite for FreeBSD...
--
-Chuck
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