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I have an ext4 partition used with rsnapshot with somewhere between 1 year to 3 years worth of hardlinks that has been shrinking over the past few days. Going from 3.64 TiB to 1.27 TiB is taking an extremely long time. Currently, been on "Updating inode references" for the past 2 days, and I'd estimate I'm about 10% to 20% of the way through that operation. How things are looking currently I might have to wait at least another week or so before the partition finishes shrinking. (Might be less since about 2 TiB of that partition is completely empty) Is there anyway to cancel resize2fs at this point without losing all of that data?
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I seriously doubt that cancelling wouldn't affect your data in any way. In any case, you should have taken a backup before doing any low level operation on the file system. At this point, you can either wait for it to finish, or cancel the operation and hope for the best.
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