Comment We have more but we USE more. (Score 5, Insightful) 170
Today, however, with a lot of file systems in the Terabyte range, a 90-95% full file system can still have a considerable amount of free space but we still mostly get bugged by the same alerts as in the days of yore when there really isn't a cause for immediate concern.
When we had drives in the 100s of MB range, we used a few MB at a time. Now that we have drives in the multi-TB range, we tend to use tens of GB at a time. In my experiences, a 90 percent full drive has as much time left before running out as it did a decade ago.
Perhaps more importantly, running at 90% of capacity kills your performance if you still use spinning glass platters as your primary storage medium (not so much when talking about a SAN of SSDs). In general, when you hit 90% full, you have problems other than just how long you can last before reaching 100%.
When we had drives in the 100s of MB range, we used a few MB at a time. Now that we have drives in the multi-TB range, we tend to use tens of GB at a time. In my experiences, a 90 percent full drive has as much time left before running out as it did a decade ago.
Perhaps more importantly, running at 90% of capacity kills your performance if you still use spinning glass platters as your primary storage medium (not so much when talking about a SAN of SSDs). In general, when you hit 90% full, you have problems other than just how long you can last before reaching 100%.