In response to a variety of technical requests from customers,
Uh-huh. :-)
the NFS protocol was revised in 1993, with the resulting protocol being designated Version 3. The new protocol is similar to its predecessor, but it makes improvements in several key areas. In particular, the new protcol implements the following changes:
- It permits write operations to be performed much more quickly through the use of a two-phase commit protocol, while still maintaining the server's stateless view of the protocol.
[ some more features cut out ]
Naturally, both the client and server systems must implement these features; since many hosts do not, some of the new features are optional and are negotiated between client and server when a file system is mounted by the client"
Is this not applicable to NetApp servers?
Well...
The async write of V3 had the most impact on non-HW accelerated NFS servers. The NetApp box uses NVRAM to support a logging scheme that make writes on NFS V2 and V3 faster.
Also, the NVRAM accelerates other modifying operations (create and remove, etc.) that are not addressed in V3.
beepy