[Gluster-devel] Is it possible to turn an existing filesystem (with data) into a GlusterFS brick ?

[Joe Julian]

Reposting to gluster-users as this is not development related. 

On November 11, 2016 6:32:49 AM PST, Pranith Kumar Karampuri <pkarampu at redhat.com> wrote:
>On Fri, Nov 11, 2016 at 8:01 PM, Pranith Kumar Karampuri <
>pkarampu at redhat.com> wrote:
>
>>
>>
>> On Fri, Nov 11, 2016 at 6:24 PM, Saravanakumar Arumugam <
>> sarumuga at redhat.com> wrote:
>>
>>>
>>>
>>> On 11/11/2016 06:03 PM, Sander Eikelenboom wrote:
>>>
>>>> L.S.,
>>>>
>>>> I was wondering if it would be possible to turn an existing
>filesystem
>>>> with data
>>>> (ext4 with files en dirs) into a GlusterFS brick ?
>>>>
>>> It is not possible, at least I am not aware about any such solution
>yet.
>>>
>>>>
>>>> I can't find much info about it except the following remark at [1]
>which
>>>> seems
>>>> to indicate it is not possible yet:
>>>>
>>>>         Data import tool
>>>>
>>>>         Create a tool which will allow importing already existing
>data
>>>> in the brick
>>>>         directories into the gluster volume.
>>>>         This is most likely going to be a special rebalance
>process.
>>>>
>>>> So that would mean i would always have to:
>>>> - first create an GlusterFS brick on an empty filesystem
>>>> - after that copy all the data into the mounted GlusterFS brick
>>>> - never ever copy something into the filesystem (or manipulate it
>>>> otherwise)
>>>>   used as a GlusterFS brick directly (without going through a
>GlusterFS
>>>> client mount)
>>>>
>>>> because there is no checking / healing between GlusterFS's view on
>the
>>>> data and the data in the
>>>> underlying brick filesystem ?
>>>>
>>>> Is this a correct view ?
>>>>
>>>> you are right !
>>> Once the data is copied into Gluster, it internally creates
>meta-data
>>> about data(file/dir).
>>> Unless you copy it via Gluster mount point, it is NOT possible to
>create
>>> such meta-data.
>>>
>>
>> No, it is possible. You just need to be a bit creative.
>>
>> Could you let me know how many such bricks you have which you want to
>> convert to glusterfs. It seems like you want replication as well. So
>if you
>> give me all this information. With your help may be we can at least
>come up
>> with a document on how this can be done.
>>
>
>Once the import is complete, whatever you are saying about not touching
>the
>brick directly and doing everything from the mount point holds. But we
>can
>definitely convert an existing ext4 directory structure into a volume.
>
>
>>
>>
>>>
>>> Thanks,
>>> Saravana
>>>
>>>
>>> _______________________________________________
>>> Gluster-devel mailing list
>>> Gluster-devel at gluster.org
>>> http://www.gluster.org/mailman/listinfo/gluster-devel
>>>
>>
>>
>>
>> --
>> Pranith
>>
>
>
>
>-- 
>Pranith
>
>
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>
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-- 
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