xenserver iso not showing up in list

Problem Description

an iso had been uploaded to the ISO datastore folder on xen-server, but it is is not showing up for attachment via virtual CDROM on VMs.

Solution

list iso datastores and get the uuid

[root@xenner ~]# xe sr-list type=iso
uuid ( RO)                : 7239d00c-ebd0-4c8b-44ba-057f3b9d7057
         name-label ( RW): ISO_images
   name-description ( RW): 
               host ( RO): xenner
               type ( RO): iso
       content-type ( RO): iso


uuid ( RO)                : 584a6b76-829f-2774-1248-2b8d1e33ba4e
         name-label ( RW): XenServer Tools
   name-description ( RW): XenServer Tools ISOs
               host ( RO): xenner
               type ( RO): iso
       content-type ( RO): iso

scan the uuid for the appropriate store (in this case, not the XenServer Tools store)

[root@xenner ~]# xe sr-scan uuid=7239d00c-ebd0-4c8b-44ba-057f3b9d7057