Question: Is it possible to use
Oracle Automatic Storage Management (ASM) with a Network
File System (NSF)? In what cases does it make sense to
use NSF with ASM?
Answer: Yes,
it is possible to use NSF with ASM but it is not recommended
for several reasons, mostly performance. This
Oracle ASM and NSF whitepaper notes that they do not
recommend using ASM with NSF:
"ASM can be configured with NFS-based
files as ASM disks. For optimal performance this is not
considered best practice, but it will work.
When
using ASM on top of NFS, the NFS files are used as ASM
disks, so the provisioning and data management model is
similar to that for ASM on SAN storage, while NFS is used to
perform I/O."
The advantage of Network File System (NSF) is
flexibility, such that a disk (or filesystem on a physical
disk spindle) can be mounted and un-mounted to map to
several different servers. In a sense, Oracle's
Automatic Storage Management (ASM) performs a similar
function, allowing an ASM disk group to be accessed natively
from many different server environments.
Experts say
that the only time when it may be recommended to use NSF
with ASM is where you have hardware that does not allow
shared disks.
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