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FAQ- Why Is the Decompression Speed of tar Files Extremely Slow During Upgrade of NMS

Publication Date:  2012-07-24 Views:  22 Downloads:  0
Issue Description
Q:
Why the decompression speed of tar files is extremely slow during the upgrade of NMS?
Alarm Information
Null
Handling Process
A:
After upgrade of the V200R001C01B061SP05 tool, the upgrade tool has made some modifications to the system in order to shorten the upgrade process of the entire NMS. Take the following file for example. The upgrade tool changed the values of mount options in /proc zone and swap zone to “forcedirectio”, so the tool can skip the file system and directly read/write the disk. Thus the library establishing speed is greatly expedited. After the upgrade, the values of mount options will be changed back to the original values. This configuration slows down the tar files decompression process considerably.
You can complete the decompression of all tar packets before starting the upgrade process. If tar decompression is required during the upgrade, you can modify the values of mount options in the files to “ ?“, and then change them back after completing the decompression. 
root@ain1 # more /etc/vfstab
#device                                      device                          mount               FS         fsck          mount             mount
#to mount                                   to fsck                          point                 type       pass        at boot           options
#
#/dev/dsk/c1d0s2                   /dev/rdsk/c1d0s2          /usr                   ufs          1                yes                    -
fd                                                         -                          /dev/fd                fd            -                 no                      -
/proc                                                   -                           /proc                proc          -                 no              forcedirectio
/dev/dsk/c3t0d0s1                            -                               -                   swap         -                 no                      -
/dev/dsk/c3t0d0s0                  /dev/rdsk/c3t0d0s0         /                      ufs          1                 no                      -
/dev/dsk/c3t0d0s7                 /dev/rdsk/c3t0d0s7      /globaldevices  ufs          2                 yes                    -
swap                                                    -                          /tmp                  tmpfs       -                 yes            forcedirectio
/dev/dsk/c3t1d0s1                /dev/rdsk/c3t1d0s1        /opt                    ufs          1                yes                     - 
Root Cause
Null
Suggestions
You are recommended to decompress all tar packets before starting the upgrade process. 

END