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

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

Hi (Cześć) Leszek,

> Just one question - is this undocumented feature with < and > also available in lizardfs which is a open source clone of MooseFS?


no, this feature is not available in LizardFS.

And MooseFS is OpenSource Software released on GPL-2.
You can download the sources here: https://moosefs.com/download/sources.html <https://moosefs.com/download/sources.html>.

-- 
Piotr Robert Konopelko
MooseFS Technical Support Engineer | moosefs.com <https://moosefs.com/>
> On 25 Jan 2016, at 12:19 PM, Leszek Szczepanowski <tw...@ms...> wrote:
> 
> Just one question - is this undocumented feature with < and > also available in lizardfs which is a open source clone of MooseFS?
> 
> 2016-01-25 10:51 GMT+01:00 Piotr Robert Konopelko <pio...@mo... <mailto:pio...@mo...>>:
> Hello Wolfgang,
> 
>> So when my drive has no more chunks on it is it save to comment out the line in mfshdd.cfg
> 
> Yes, when all chunks are moved out from this drive
> (in MFS CGI next to this drive, in column "chunks" 0 is shown),
> you can safely comment this drive out in mfshdd.cfg.
> 
> 
> Best regards,
> 
> -- 
> Piotr Robert Konopelko
> MooseFS Technical Support Engineer | moosefs.com <https://moosefs.com/>
>> On 22 Jan 2016, at 11:13 AM, Wolfgang <moo...@wo... <mailto:moo...@wo...>> wrote:
>> 
>> Hi Piotr Robert!
>> 
>> I think using "<" moves the data - as my drive marked is slowly decreasing in chunk-count.
>> Also syslogs says so:
>> ---
>> move chunk /data/disc1/mfschunk/ -> /data/disc2/mfschunk/ (chunk: 0000000000026440_00000001)
>> ---
>> 
>> So when my drive has no more chunks on it is it save to comment out the line in mfshdd.cfg or should this drive then be marked with * and waited for "READY" in MFS CGI ?
>> 
>> 
>> Thanks for your always detailed answers!
>> Greetings
>> Wolfgang
>> 
>> 
>> 
>> On 2016-01-21 23:55, Piotr Robert Konopelko wrote:
>>> Hi Wolfgang,
>>> 
>>>> On 21 Jan 2016, at 10:55 PM, Wolfgang < <mailto:moo...@wo...>moo...@wo... <mailto:moo...@wo...>> wrote:
>>>> 
>>>> Hi Piotr Robert!
>>>> 
>>>> When using < or > should I use the * also?
>>> 
>>> No, you shouldn't use both * and (< or >)
>>> 
>>>> like:
>>>> <* /data/disc1
>>>> when disc1 should be removed in near future?
>>> 
>>> No
>>> 
>>>> or either
>>>> * /data/disc1
>>>> < /data/disc1
>>> 
>>> Yes
>>> 
>>>> So to make this clear:
>>>> data from discs marked with * will be moved anywhere in the cluster
>>> 
>>> Yes
>>> 
>>>> data from discs marked with < will be moved to other discs (or if set only to the ">" marked discs) on the same chunkserver
>>> 
>>> Yes
>>> 
>>>> So I guess using * or < but not both - am I right?
>>> 
>>> Yes :)
>>> 
>>> One more note:
>>> When you use * before disk path, data (chunks) are not moved, they are replicated,
>>> so an extra copy of chunks from such disk marked for removal with * is made by MFS.
>>> (You can see a lot of overgoal chunks in blue on all chunks state matrix in MFS CGI and when
>>> you disconnect such drive when it is "ready", no undergoal chunks should be visible,
>>> only most of overgoal chunks should disappear from chunks matrix).
>>> 
>>> I'm not sure at this moment, but as far as I remember, when you use "<" (and/or ">"),
>>> data (chunks) are not replicated, they are moved to another drive(s) on the same machine.
>>> 
>>> I didn't used / tested this feature ("<" and ">") for a long time, so I'm not sure here whether
>>> it replicates the data or moves it, but as I said above, probably it moves.
>>> (I can perform a test when I'll be at the office - most possibly I can do it tomorrow's
>>> afternoon, so probably you'll be faster than me :)
>>> 
>>> 
>>>> Thank you & Greetings
>>>> Wolfgang
>>> 
>>> 
>>> Best,
>>> 
>>> -- 
>>> Piotr Robert Konopelko
>>> MooseFS Technical Support Engineer | moosefs.com <https://moosefs.com/>
> 
> 
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> 
> 
> -- 
> -- 
> Leszek A. Szczepanowski
> tw...@ms... <mailto:tw...@ms...>