Update script fails due to Service capacity I am trying to update the core of my Drupal site. I neglected updates for some time and the update script had 19 updates pending. Apperently the update script tries to do all of this in one go, and fails miserably. I get an error message like this:


StatusText: Service Unavailable ResponseText: 503 Service Unavailable Service 
Unavailable The server is temporarily unable to service your request due to maintenance
downtime or capacity problems. Please try again later.



and this one:


  An AJAX HTTP error occurred. HTTP Result Code: 503 Debugging
  information follows. Path: h t t p
  ://mysite.com/update.php?op=selection&amp;token=7R0M7yvUZR09UsRDFf9FUAYhV9Ui82efUzsZPh61JZU&amp;id=152&amp;op=do
  StatusText: Service Unavailable ResponseText: 503 Service Unavailable
  Service Unavailable The server is temporarily unable to service your
  request due to maintenance downtime or capacity problems. Please try
  again later.


I have the following questions:


Has anyone seen this one before? If so how do I solve it?
If not, can I run the other 18 pending updates somehow?
If not, how harmfull is it if I don't run update.php?
Attempt to answer your questions ...


  Has anyone seen this one before? If so how do I solve it?


I've never seen this error before. But what I don't see anywhere in your question is that you FIRST disabled all modules, prior to upgrading Drupal core. And that is problably where your error originates from.

So if you have not done that, try doing so now as a first step. Note each of the modules you're disabling, so that afterwards you know which one to re-enable again. Note "all" is more then just the 18 modules you mentioned that needed updating (so also those modules which do not require any update).

After all these modules are disabled, try to upgrade Drupal Core. I'd expect that upgrading core then should work just fine.


  If not, can I run the other 18 pending updates somehow?


I would NOT try to do that. Instead first make sure core is upgraded, as explained in my prior item.

After core upgrade completed fine, re-enable all modules again that you disabled to complete the core upgrade. From then on the 18 pending updates should appear also again (of course). Then perform the update of each of those 18 modules, one by one.


  If not, how harmfull is it if I don't run update.php?


NOT running update.php is not something I would consider. In other words: if your Drupal installation shows messages that updates are pending, you better apply them ASAP.

Does this help somehow?

PS: worst case (if everything else goes wrong): restore from your last backup (you have that, right???). Then apply the steps I described above. I'd assume you would not run into similar errors anymore.