How full is too full?

I have read several accounts of the troubles people have when filling their Xserve RAID too full.
How full is too full? 85%? 90%? 95%?
Thanks,
Ed

I don't think there is a hard limit due to the differences in file types - it's likely to be different depending on whether you have thousands of multi-gigabyte files or millions of 4K files.
As a general rule I'd use 90% as the limit to work to, but don't be surprised if performance degrades before then.

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