This issue, including jay03 / alfa's cross-posted message and Todd's prompt response to the problem (chassis swap for the server) is fully covered on the Site5 forum: forums.site5 dot com/showthread.php?p=13774
No-one likes downtime but most of us accept that it happens sometimes. The main thing is that the host responds promptly and fixes it.
So down time in total = 1.5 + 2.3 hrs = 3.8 hrs.
Is this normal? I dont know. you be the judges.
 the ~4 hrs downtime is not a joke. I can confirm that*. [/edit]
*note the smily.
[edit2] If anyone has visited site5.com, they know how well designed it is. And if anyone is lucky enough to have Matt design their web page, they are truly luckly. And I would ask Matt to design my web page, but if you read the FAQ:
9. Do you make websites for people?
No. Definitely not. Absolutely, positively not. Making websites is really hard work, and if there's one thing we don't like, it's hard work!
Seriously though, if Matt had more than 24hrs in a day, he could make some serious $$$ from web design. Note to matt: future april fool's joke?[/edit]
I would like to clear up an issue that may lead to serious confusion. This threads subject is very misleading. One of our servers, in our very large fleet, has recently experienced a spat of instability. As a result, users have experienced moderate downtime.
To be clear, our entire network was not offline--the instability is isolated to one specific server.
Further to details already made available in our forum, the server in question (collosex) has had its RAM swapped as well as a full chassis swap. Unfortunately, the server did fail again tonight.
The only hardware in the server that hasn't been swapped are the hard drives. We are working on a maintenance plan to swap the hard drives within the next 24 hours.
Site5 is working very aggressively toward reinstating stability to our server. For complete details on what we've done thus far & what our plans are, please see our forum.