Re: [MooseFS-Users] Marking disc for removal - chunkserver gets no more chunks

[Piotr R. K. <pio...@mo...>]

Marking disk as removal just informs MooseFS that:
It should not write new chunks to this drive (as you observed)
Chunks are replicated to another Chunkservers

There is a feature available to achieve what you want, but it is not documented yet (it will be).

You can migrate chunks from e.g. one (or more than one) drive(s) on chunkserver to another drive(s) on the same chunkserver.

If you put in mfshdd.conf sign '>' (without quotes of course) before specific path, such disk is marked as target/destination for migration.
If you put sign '<', such disk is marked as a source for migration.

If you define in mfshdd.conf more than one source or destination drive, all of them will be grouped - respectively source ones or destination ones. If you mark only source drive(s), all other will be treated as target (so it is your case - mark only one as a source), and similarly - if you mark only target drive(s), all other will be treated as source ones.

Target drives can be filled up in 99% max (it is a hard-coded constant, maybe it will be configurable for specific HDD(s) in the future)

And one more note: if any drive is marked as source or target drive, space usage equalisation algorithm is disabled.


Best regards,

-- 
Piotr Robert Konopelko
MooseFS Technical Support Engineer | moosefs.com <https://moosefs.com/>
> On 21 Jan 2016, at 5:01 PM, Wolfgang <moo...@wo...> wrote:
> 
> Hi List!
> 
> In my cluster I have a chunkserver with 3 discs mounted to seperate 
> directories and showing as 3 lines in the "Disks" overview.
> 
> When I mark one of these discs for removal (by prepending a * in the 
> mfshdd.cfg and reload this disc gets status "marked for removal (not 
> ready)" and doesn't get any new chunks which is what I expected.
> 
> When I now watch as chunks get copied so this disc can be removed - it 
> seems to me that the 2 other discs of this chunkserver (or the whole 
> chunkserver) don't get any new chunks either? Why is this? Wouldn't it 
> be the fastest to move the chunks from the "marked for removal" disc to 
> the other discs at the same chunkserver?
> 
> Thanks for clearification.
> 
> Greetings from snowy austria!
> Wolfgang
> 
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