"Poller Output Table not Empty" error on ss_host_disk

[cgu]

hello,

I try to have some devices polled with this "ss_host_disk" script but unfortunately in some cases this doesn't work, the rrd files keep not being updated (they remain full of NaN values). And at the end of the polling cycle I get a warning about this for all the datasources that haven't been updated :

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10/23/2015 10:49:01 AM - POLLER: Poller[0] WARNING: Poller Output Table not Empty.  Issues Found: 152, Data Sources: hdd_total(DS[17771]), hdd_used(DS[17771]), hdd_total(DS[17773]), hdd_used(DS[17773]), hdd_total(DS[17777]), hdd_used(DS[17777]), hdd_total(DS[17779]), hdd_used(DS[17779]), hdd_total(DS[17784]), hdd_used(DS[17784]), hdd_total(DS[17795]), hdd_used(DS[17795]), hdd_total(DS[17796]), hdd_used(DS[17796]), hdd_total(DS[17797]), hdd_used(DS[17797]), hdd_total(DS[17800]), hdd_used(DS[17800]), hdd_total(DS[17801]), hdd_used(DS[17801]), hdd_total(DS[17810]), Additional Issues Remain.  Only showing first 20

However if I check for example the first one (DS[17771]) in the logs at this period , here is what I get :

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10/23/2015 10:48:06 AM - SPINE: Poller[0] Host[83] DS[17771] SS[2] SERVER: /export/appl/cacti/scripts/ss_host_disk.php ss_host_disk 10.101.75.13 83 2:161:500:2:10:redacted:::::: get used 3, output: 3862990848
10/23/2015 10:48:06 AM - SPINE: Poller[0] Host[83] DS[17771] SS[1] SERVER: /export/appl/cacti/scripts/ss_host_disk.php ss_host_disk 10.101.75.13 83 2:161:500:2:10:redacted:::::: get total 3, output: 5729300480

So it seems to me that the value is collected as expected. And in the poller_output table I can see two records for this datasource, for the two items (hdd_total and hdd_used), both of them having their "output" field populated and "time" field = last polling time. However in the log I see that the "rrdtool update" part is not run for this data source, but can't figure out why.

On the other hand some other datasources using the same script on the same devices are working fine.

Any help is appreciated. Please ask if any more info is needed.

running cacti 0.8.7e, on linux server.