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

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

Hi Wolfgang,

small errata:

> Chunks are replicated to another Chunkservers


Should be "Tells MooseFS to replicate chunks from such drive to another"



Greetings from also-snowy Poland :)

-- 
Piotr Robert Konopelko
MooseFS Technical Support Engineer | moosefs.com <https://moosefs.com/>
> On 21 Jan 2016, at 5:31 PM, Piotr Robert Konopelko <pio...@mo...> wrote:
> 
> 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... <mailto: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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