An uninterruptible power supply (UPS) isn’t really necessary for the Igaware Linux Small Business Server. In fact we don’t recommend putting the Igaware Linux Small Business Server on a UPS because they can be problematic; UPS batteries start to die after a year or so, causing output voltage problems and unintentional shutdowns, hangs, etc.
The Igaware Linux Small Business Server is VERY robust to power outages. The Igaware Linux Small Business Server makes sure that disk writes are completed in a transactional manner and at any point in time all disk data is consistent. Even if the power goes off the disk state is guaranteed to be consistent. It’s know as linux “barriers” mode. Also, during a power off the desktops/ routers, etc will power off anyway, meaning that not a lot is going on through the Igaware Linux Small Business Server.
The barriers option was enabled recently, because a few naughty customers seemed to just switch everything off – including the Igaware Linux Small Business Server, routers, etc – if they had any network problems.
We will revisit the whole UPS situation, as a matter of customer choice.