On 2013-08-24 11:24, Joel Johnson wrote:
Should I file a few bugs to capture the related issues? Here are the
discrete issues that seem to be present from a user point of view:
After writing this, I figured I'd experiment with the current state and
try to properly delete and add the sdd device. However, I was surprised
to find that I'm not allowed to remove one of the two drives in a RAID1.
Kernel message is "btrfs: unable to go below two devices on raid1" Not
allowing it by default makes some sense, however a --force flag or
something would be beneficial. I understand that the preferred method is
to add the replacement device first and then delete the old one (or do a
direct replace), however the system I'm using for testing only has three
SATA ports, the first is used for the system drive, and the second and
third have the two drives I'm using for my btrfs testing - I have no way
to add a third drive for the filesystem before removing one first. This
is still with the filesystem mounted with the degraded mount option set.
As it stands, I don't see how I can run btrfs reliably on this system
since I now know I want to properly remove devices and add them, but I'm
unable to do so with the limited number of drive interfaces, requiring
hot removal of drive, and either readding it, or using another system to
clear the drive before readding it.
Is there a flag I'm missing? If not, I'd add a fourth bug item:
4. allow (forced only if appropriate) removal of redundant drives (e.g.
second drive in RAID1)
Joel
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