[NFS] Will NFS client use write-back caching?

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Hello,

My client is running ext3, which default has 5 seconds of write-back
caching, e.g.

 cat /proc/sys/vm/dirty_writeback_centisecs
499

Now, if this client connect to a NFS (v3), and write data to the NFS,
will write-back caching used?

Or it will fsync() after every write ?

Thanks.

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