My drive is failing
Device: /dev/sda [SAT], 4 Currently unreadable (pending) sectors
what would be the best way to migrate the storage?
Why do you want to migrate the storage? It is still working, right? Couple of bad sectors here and there are irrelevant.
But if you want to anyway — any of the migration techniques described on the forum and in the documentation will work.
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You may use a ddrescue utility to clone the disk, then fix the filesystem if needed and expand if needed. You may also use a standard migration procedure:
You may also use rclone instead of rsync, many reported that it’s faster.
Or just check and fix errors include marking of bad sectors and continue run the node.