this is the server extended config file. Here you can configure storage ips for the individual server.

#
#  XenServer Extended Configuration
#
# Tagconfiguration
<tag XenHostField>
    typ host
    do set
    oc XenCenter.CustomFields.ilo
    key https://10.10.77.75
</tag>

<net Storage2Srv> 
        typ Storage
        ip 10.10.88.75
        netmask 255.255.255.0 
</net>