Hi Abhinandan,
Yes my pool is using shared NFS storage.
Xen tools installed, but not latest version on one of the VM. Interestingly, 
this morning I can't reproduce the problem of lost ISO at reboot, even on 
another that was failing yesterday. That one has always had the latest xen 
tools installed.
Migration however still detach the ISO, on all of them.

Two examples of Xen SR for mounted ISO. One was created as "shared" and 
available to all the hosts:
uuid ( RO)                : d024ab04-c39d-33f2-209f-89dc7ee50dac          
name-label ( RW): i-6-184-VM-ISO    name-description ( RW): 
10.0.20.10:/vol/cs_sec_prd/template/tmpl/2/221                host ( RO): 
<shared>                type ( RO): iso        content-type ( RO): iso
While most remain local to one host:
uuid ( RO)                : af43d09b-0b3b-faf4-804c-43cb2005e895          
name-label ( RW): i-8-820-VM-ISO    name-description ( RW): 
10.0.20.10:/vol/cs_sec_prd/template/tmpl/2/314                host ( RO): xs001 
               type ( RO): iso        content-type ( RO): iso             
I can't get hold off a new "shared" ISO SR. I don't get this behavior and how 
this is managed...
thx!
> From: [email protected]
> To: [email protected]
> Subject: Re: CS and Xen ISO sharing in a pool
> Date: Thu, 12 Nov 2015 03:51:42 +0000
> 
> Assuming that your pool is using shared storage. Are the Xentools installed 
> on the VM ?
> 
> 
> On 11/11/15, 10:19 PM, "Patrick W." <[email protected]> wrote:
> 
> >Hi All,
> >ACS 4.4.1, Xen 6.2 poolWhen I attach an ISO to a VM, it creates the SR on 
> >the host running the VM and mount it there. The ISO's available as expected 
> >so far. If I reboot the VM, or migrate it to another host, I lose the 
> >attached ISO, while it remain attached for ACS. I then need to do an 
> >unattach and reattach operation.Anybody experiencing this? Can't the ISO SR 
> >be created as a "Shared" SR on the Xen Pool instead of a unique host and 
> >therefore keep it attached during those restart / migration operation?
> >Appreciate any input,Many thanks
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