<div dir="ltr">Thanks a lot Rechard for your inputs. </div><div class="gmail_extra"> <div class="gmail_quote">On Fri, Sep 12, 2014 at 11:23 PM, Richard W.M. Jones <<a href="mailto:rjones@redhat.com" target="_blank">rjones@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Fri, Sep 12, 2014 at 10:40:14PM +0530, Priyanka Ranjan wrote: > Hello Experts, > > I need a help from you . I am using CentOS 6.4 and using guestfish > to modify an ESX image. > > I am adding a disk, executing "run" command and mounting it. the > "run" command is taking around 50 seconds . Is there any way to > minimize it. So first of all, measure the performance. Run the simple baseline tests here: <a href="http://libguestfs.org/guestfs-performance.1.html#baseline-measurements" target="_blank">http://libguestfs.org/guestfs-performance.1.html#baseline-measurements</a> If, after several runs, this stays at ~ 50 seconds, then it's likely because you are running this inside a virtual machine, on Amazon EC2, or on a machine which has virtualization disabled (eg in the BIOS settings). You can fix that by using baremetal (or maybe nested virt). You will find other tips in the guestfs-performance(1) man page that I linked to above. > If we can not minimize it then Can we create and keep the guestfish > virtual shell open so that we can just add a disk , mount and modify > the image in few seconds. Yes, but unfortunately not on CentOS 6. On RHEL / CentOS 7 we support hotplugging in both libguestfs and guestfish, and that lets you do exactly what you describe above. <a href="http://libguestfs.org/guestfs.3.html#hotplugging" target="_blank">http://libguestfs.org/guestfs.3.html#hotplugging</a> Rich. -- Richard Jones, Virtualization Group, Red Hat <a href="http://people.redhat.com/~rjones" target="_blank">http://people.redhat.com/~rjones</a> Read my programming and virtualization blog: <a href="http://rwmj.wordpress.com" target="_blank">http://rwmj.wordpress.com</a> libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. <a href="http://libguestfs.org" target="_blank">http://libguestfs.org</a> </blockquote></div> </div>