Why is the write speed on NFS share slower than the write speed on local file system?

Solution Verified - Updated -

Issue

  • Performing write operations on NFS shares is three times slower than the local file system.
  • Why does write speed slow over NFS as compared to local file systems(ext3,ext4)
  • Creating a file on local disk
$ dd if=/dev/zero of=/app/test.txt bs=1G count=1 oflag=direct
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB) copied, 4.2535 seconds, 252 MB/s
$
  • Creating a file on NFS mount point
$  dd if=/dev/zero of=/mnt/test.txt  bs=1G count=1 oflag=direct;date;rm /orabackup/t.txt
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB) copied, 13.4193 seconds, 80.0 MB/s
$

Environment

  • Red Hat Enterprise Linux (ALL)

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