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

[Wolfgang <moo...@wo...>]

Hi Piotr Robert!

When using < or > should I use the * also?
like:
<* /data/disc1
when disc1 should be removed in near future?
or either
* /data/disc1
< /data/disc1


So to make this clear:
data from discs marked with * will be moved anywhere in the cluster
data from discs marked with < will be moved to other discs (or if set 
only to the ">" marked discs) on the same chunkserver

So I guess using * or < but not both - am I right?

Thank you & Greetings
Wolfgang



On 2016-01-21 17:31, Piotr Robert Konopelko wrote:
> Marking disk as removal just informs MooseFS that:
>
>  1. It should not write new chunks to this drive (as you observed)
>  2. 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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