Re: Extend BTRFS_IOC_DEVICES_READY for degraded RAID

Austin S Hemmelgarn <ahferroin7@xxxxxxxxx> · Mon, 05 Jan 2015 07:08:24 -0500

On 2015-01-05 06:31, Lennart Poettering wrote:
On Mon, 05.01.15 10:46, Harald Hoyer (harald@xxxxxxxxxx) wrote:

We have BTRFS_IOC_DEVICES_READY to report, if all devices are present, so that
a udev rule can report ID_BTRFS_READY and SYSTEMD_READY.

I think we need a third state here for a degraded RAID, which can be mounted,
but should only after a certain timeout/kernel command line params.

We also have to rethink how to handle the udev DB update for the change of the
state. incomplete -> degraded -> complete

I am not convinced that automatically booting degraded arrays would be
a good idea. Instead, requiring one manual step before booting a
degraded array sounds OK to me.

Lennart

I can think of half a dozen use cases where it is better to 
automatically mount degraded and send a notification that this happened 
than to refuse to mount without manual intervention.

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