[Gluster-users] Does Gluster Support "Dynamic Configuration of Stripe count" ?

[Subrata Ghosh]

Yes we have files whose sizes sometimes exceeds brick size .
This case also hits when we have partially filled bricks and then we 
want to create a single file using the space available in all the 
bricks, even though that file size is lesser than a bricksize.

Example:

Say we have three bricks of 10 MB each.
Each brick is filled with one 5.1 MB file each, initially.
Now the left over space is 4.9 MB in each brick. So total space is 4.9 
MB * 3 = 14.7 MB. We cannot now create a file of atleast 5 MB.

Thanks
Subrata


On 07/23/2014 10:38 AM, Joe Julian wrote:
> To you have single files that exceed brick sizes which grow and shrink?
>
> On July 22, 2014 10:02:16 PM PDT, Subrata Ghosh 
> <subrata.ghosh at ericsson.com> wrote:
>
>     Can you please help for  this. It is really becoming critical for us.
>
>     Regards,
>     Subrata
>
>
>     On 07/22/2014 04:45 PM, Subrata Ghosh wrote:
>>     Hi ,
>>
>>     We are using GlusterFS in our product for DFS. We have found an 
>>     issue  in using "striping" while experimenting with Striped
>>     Volumes in our DFS infrastructure. We thought of  enable striping
>>     to support "Max Files Size" when a file dynamically grows/shrink
>>     over time inside a brick. We need to add more storage dynamically
>>     to handle this situation and striped the file across bricks to
>>     fit it properly in that striped volume .
>>
>>     *Question*:  is  Does Gluster supports "dynamic configuration of
>>     Stripe Count" (increment / decrement stripe count) of Striping 
>>     currently  ?
>>
>>     We tried with following two  basic experiments :
>>
>>     1. Create a volume with two bricks with stripe count 2 with no
>>     replica ( to simplify ).
>>
>>     2. Add one more brick in that volume and increase stripe count by
>>     one ( the stripe count becomes 3 now) .
>>            - Seems it works  fine and files are being striped across
>>     3 bricks as per specified chunk-size .
>>
>>     3. However faced issues while removing a brick from the volume
>>     and decrement stripe count by one again ( so the stripe count
>>     becomes 2 again)
>>         => Gluster is  not allowing to reduce the stripe count in
>>     this scenario.
>>
>>     Could you please help us by clarifying this.
>>
>>     Thanks for your help
>>
>>     Regards,
>>     Subrata Ghosh
>>     (Ericsson  R&D) 
>
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