Exporting mogile files and db to another set of servers

dormando dormando at rydia.net
Mon Feb 4 07:27:28 UTC 2008

sanados wrote:
> dormando wrote:
>>> idea: another state would be appreciated: initialize
>>> when you first enter a device mark it initialize.
>>> So it would cleanup old files / directories, does filesystem checks, ...
>>> (just a thought)
>> First enter a device? If you're adding a brand-new device it should be
>> freshly formatted? :) MogileFS is flexible about not caring how the
>> device was initialized (or even if it has other data on it), so it's
>> pretty nice to ignore that.
>> Having lost files in the middle of the device that are unlinked
>> everywhere else is bad tho. Fsck could probably have a scrubber mode
>> you'd run once in a while, while these bugs are fixed.
>> Or are you referring to something else?
> I was refering to the situation that you bring an dead / down device
> online again.
> When the replication cleaned up every files there are quite some ghosts
> on the once dead device.

Dead devices should never be brought back alive. Just remake the
filesystem and create a new device id.

... and yeah, I'm seeing some turds on `drain`ed devices. From a hundred
megs to a gig or two... I'm sure we can work in code to clean those up,
but I don't really consider it a fix for files left on 'dead' devices,
since those are supposed to go away.


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