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by wtallis
3218 days ago
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> rebalance to have 3-way mirroring across 3 drives (with one being out): this is currently not possible I'm not sure this even has meaning. But anyways, it's probably pointless to try to kick off a rebalance when the FS is still trying to use a dead drive. Either use the device replace command (which isn't stable yet), or tell btrfs to delete the dead drive then add the replacement drive. If the problem drive is failing but not completely dead yet, then the device replace command is supposed to move data over with a minimum of excess changes to drives other than the ones being removed and added. But the device replace command doesn't properly handle drives with bad sectors yet, so the separate remove and add actions are more reliable albeit slower and put more work on the other drives in the array. |
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Where can I find the proper official procedure to replace a failed drive (i.e. which cannot be mounted anymore) in a RAID1 array (with 2 drives) ?
I found these 2 links: https://unix.stackexchange.com/questions/334228/btrfs-raid1-... https://unix.stackexchange.com/questions/227560/how-to-repla...
But it is written there that if 'replace' doesn't work, it can take up to 5 days using add/remove for only 100GB !
I haven't found any official procedure on the Btrfs wiki.