On 08/15/2015 02:12 AM, Timothy Normand Miller wrote:
Sorry about that empty email. I hit a wrong key, and gmail decided to send. Anyhow, my replacement drive is going to arrive this evening, and I need to know how to add it to my btrfs array. Here's the situation: - I had a drive fail, so I removed it and mounted degraded.
that bit dangerous to do without the below patch. patch has more details why.
- I hooked up a replacement drive, did an "add" on that one, and did a "delete missing". - During the rebalance, the replacement drive failed, there were OOPSes, etc. - Now, although all of my data is there, I can't mount degraded, because btrfs is complaining that too many devices are missing (3 are there, but it sees 2 missing).
This is addressed in the patch [PATCH 23/23] Btrfs: allow -o rw,degraded for single group profile Thanks, Anand
So I could use some help with cleaning up this mess. All the data is there, so I need to know how to either force it to mount degraded, or add and remove devices offline. Where do I begin? Also, doesn't it seem a bit arbitrary that there are "too many missing," when all of the data is there? If I understand correctly, all four drives in my RAID1 should all have copies of the metadata, and of the remaining three good drives, there should be one or two copies of every data block. So it's all there, but btrfs has decided, based on the NUMBER of missing devices, that it won't mount. Shouldn't it refuse to mount if it knows there is data missing? For that matter, why should it even refuse in that case? So some data might missing, so it should throw some errors if you try to access that missing data. Right? Thanks!
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