Un-reserving 5% Reserved space in non-root filesystem

Praveen Kumar G T

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Jan 28, 2019
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I understand that by default, newly created filesystems will be created with 5% of the space allocated for root. I also know you can change the defined space with:

tune2fs -m 1 /dev/sdXY

Is this reserved space make sense for external drives. We have 3.4 TB harddrives in our production cluster and we have 10K of them. so wasting 5% in each drive is a huge loss of space for us.

But I was told that 5% is needed to avoid any performance issue because of fragmentation etc. As we want to gain the 5% space, we also want to make sure that the performance is not impacted. Can anyone suggest what are the side effects of reducing this 5%. Our workload involve lot of reads, writes and deletes.

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