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From: Qu Wenruo <>
To: Alex Powell <>,
Subject: Re: Unable to delete device
Date: Sun, 10 Nov 2019 11:41:59 +0800
Message-ID: <> (raw)
In-Reply-To: <>

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On 2019/11/10 上午9:14, Alex Powell wrote:
> Hi all,
> I had a disk fail on my BTRFS RAID5 array. It is still mounting but
> there are bad sectors which will switch the array to read only mode
> when used.

Nope, regular sector shouldn't cause RO mount.

Dmesg please for the RO (transaction abort).

> I used "btrfs device delete /dev/sdd /mnt/data" to remove it from the
> array. However it seems that it is only partially removing it from the
> array and when it gets to the bad sectors it fails.
> localhost ~ # btrfs device delete /dev/sdd /mnt/data
> ERROR: error removing device '/dev/sdd': Input/output error

This is another different problem.
Dmesg please.

This can be caused by bad sector + failed to rebuild data.
Please keep in mind RAID5 of btrfs can't handle write hole yet, thus
it's not ensured to tolerant one corrupted disk.

> What is best practice for removing the drive from the array in this situation?
> Kind Regards,
> Alex Powell

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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-10  1:14 Alex Powell
2019-11-10  3:41 ` Qu Wenruo [this message]
2019-11-10  3:48 ` Anand Jain

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