is BtrFs failing to alert?
Yes. Btrfs does not do that. as of now.
Only action that it takes is to put FS into readonly mode. That may
be fine for ext4 kind of FS but its not correct from the btrfs Volume
Manager perspective.
A work in progress at my end to fix that.
> [996932.735110] end_request: critical target error, dev sdd, sector
526344
> [996932.735280] md: super_written gets error=-121, uptodate=0
> [996932.735290] md/raid1:md2: Disk failure on sdd2, disabling device.
> md/raid1:md2: Operation continuing on 1 devices.
MD is a complete volume manager, Btrfs isn't yet.
My recent patch (below), is a step towards that. Its not yet
integrated.
[PATCH 3/3] Btrfs: introduce function to handle device offline
HTH, Anand
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