Slow writing speed on one of the partition created over VMware virtual disk

Solution Verified - Updated -

Issue

  • We are getting slow writing speed on one of the partition created over VMware virtual disk.
    Writing speed on /home is very less as compared to writing speed on /root:

    # dd if=/dev/zero of=/root/testfile bs=1G count=1 oflag=direct
    1+0 records in
    1+0 records out
    1073741824 bytes (1.1 GB) copied, 7.05611 s, 152 MB/s             <---
    
    # dd if=/dev/zero of=/home/testfile bs=1G count=1 oflag=direct
    1+0 records in
    1+0 records out
    1073741824 bytes (1.1 GB) copied, 75.2144 s, 14.3 MB/s            <---
    

Environment

  • Red Hat Enterprise Linux 5, 6, 7
  • VMware virtual disks

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