Thursday, May 28, 2015

What is the difference between soft mount and hard mount in aix?

What is the difference between soft mount and hard mount in aix?


Scenario:

·        After reboot, the target server is trying to mount the nfs filesystem as part of boot process, in the same time the source server went to offline or some one reboot the source server, in this case what will happen.

·        if the filesystem mounted to the target server as soft mount, then it will contact the source server and tring to mount the filesystem, if it does not get the source server within a while, then it will stop to contact the source server and  make the target server to come online without mounting the filesystem.

·        If the filesystem mounted to the target server as hard mount, then it will wait until the source server to come online to mount the filesystem as per the above scenario, so in this case the target server can not up until the source server is accessible.


Simply we can explain like below.

·        A soft mount will return an error if the source server goes offline.

·        A hard mount will wait until the server comes back online, and then begin to transferring /copying again.


·        It is really best practice when you mount the filesystem as soft mount. 




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