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    These would be quite handy for client-facing ML apps. Would love it if they enable encryption on these volumes too.

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      increase the size of the volume and expand the file system to match, with no downtime

      Are there Linux filesystems that can be safely expanded without unmounting the volume?

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        not a linux expert at all – but my understanding is ext3 (and thus 4 as well) can be resized without un-mounting first.

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          xfs_growfs supports online growth of XFS fileystems (although it doesn’t support shrinkage).

          Like pyvpx said, ext3+4 supports online resize.

          It also looks like Btrfs supports online resize.

          Is there any Linux filesystem that can’t be safely expanded without unmounting the volume? :)

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            Indeed, there are a number - ext3, ext4 and XFS, along with btrfs and ZFS too.