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I want to convert the 3TB 80% full ext4 block device into btrfs and I want to estimate the time it will take. I understand that this process is disk-bound rather then cpu- or memory-bound. So can anyone explain me how long it will take in units of time it takes to read/write the whole volume?

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The whole process tool 5h25min, which is roughly 1⁄4 the time needed to re-balance the underlying RAID-5 mdadm device that span 5 modern 3TB SATA hard drives connected to two independent PCI-E controllers.

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