Post installation

My hobby suddenly got a lt more serious.
It is now my second job, I get paid for it, and now I've been granted my very own dedicated Drupal server for all my present and coming Drupal projects. The catch is that I allso was granted the reponsibility to administer the Drupal isntallation, and keep everything running.
In short: If we get downtime due to Drupal, I get the blame. So I'm going to do my best to allways install the latest security updates, and stay up to date on other issues and vulnerablilities.
To lessen the workload (This is after all a job #2, to be performed after my day job) I'm planning on setting up a multisite setup, with a single codebase, and centralize the basic modules and themes. And thus a number of questions arises:
- How many sites can be run of a single codebase? Are there any limitations I should be aware of (I think I've read something about the cron.php script becoming a heavy dutie script to run if there are too many sites)
- All of my sites are most probably going to have separate databases, is there any way of updating all of them with one single script, when I update the Drupal core. Or is there no way around logging into 20 ish different sites as admin, and run the update.php script.
- I've got absolutely no experience being a server administrator (server admin is not quite right though, I do not have responsibilities for the basic LAMP installation). Are there other issues / problems / challenges I should be aware of when I start running this server?

Hello, I have a question concerning multisite setups from a single codebase. I have several domains served by a single codebase. I would like to set up testing Drupal sites in directories. To explain myself:

sites
        www.site1.com
              settings.php
        www.site2.com
              settings.php

is ok, but I'd like to have Drupal test sites under

Description

i keep getting this error:

user warning: Table 'bizibodi_boomng.ec_variation' doesn't exist query: SELECT vid FROM ec_variation WHERE ptype = 'apparel' in /home/www/boomng.com/includes/database.mysql.inc on line 120.

where
bizibodi_boomng is the name of my database

Hi there!
I´ve been looking at the Snippets area but didn´t find this stuff...
I want to show inside a block visible only to role X, the last coment of a specific node item (ie. a page) in a trimmered version.

I mean something like this:

NODE TITLE
There are X comments.
Last comment on XXXX
"bláh bláh..." (click here to read more)

But I want that single item only to be shown.

At this point I´m pretty sure that everything is possible with Drupal... my problem here is to know how should I do it :-)

Thanks in advance!!

I am trying to design a multisite configuration for a large site and would appreciate some suggestions about what I should consider regarding the following questions:

my Host requires that i use the -f command after the email address when sending email via the site.

for example.

when I send mail it looks somthing like this.

$subject = 'My Subject';
$emailaddress = 'webmaster@pacevp.com';
$additional = '-f';

$mail($subject, $emailaddress, $additional);

the syntax may not be 100% correct, but you get the idea.

At any rate, i need to tell drupal to use the -f command.

how do i do it?

thanks,
chris