[Gluster-users] using a preferred node ?

[Mathieu Chateau]

>From this slide (maybe outdated) it says that reads are also balanced (in
replication scenario slide 22):
http://www.gluster.org/community/documentation/images/8/80/GlusterFS_Architecture_%26_Roadmap-Vijay_Bellur-LinuxCon_EU_2013.pdf

Except for write, having an option to do only "failover" for reads & lookup
would be possible I guess ?


Cordialement,
Mathieu CHATEAU
http://www.lotp.fr

2015-06-08 8:11 GMT+02:00 Ravishankar N <ravishankar at redhat.com>:

>
>
> On 06/08/2015 11:34 AM, Mathieu Chateau wrote:
>
> Hello Ravi,
>
>  thanks for clearing things up.
>
>  Anything on the roadmap that would help my case?
>
>
>
> I don't think it would be possible for clients to do I/O only on its local
> brick and yet expect the bricks' contents to be in sync in real-time..
>
>
>
>   Cordialement,
> Mathieu CHATEAU
> http://www.lotp.fr
>
> 2015-06-08 6:37 GMT+02:00 Ravishankar N <ravishankar at redhat.com>:
>
>>
>>
>> On 06/06/2015 12:49 AM, Mathieu Chateau wrote:
>>
>> Hello,
>>
>>  sorry to bother again but I am still facing this issue.
>>
>>  client still looks on the "other side" and not using the node declared
>> in fstab:
>> prd-sta-sto01:/gluster-preprod /mnt/gluster-preprod glusterfs
>> defaults,_netdev,backupvolfile-server=prd-sta-sto02 0 0
>>
>>  I expect client to use sto01 and not sto02 as it's available.
>>
>>
>>  Hi Mathieu,
>> When you do lookups (`ls` etc), they are sent to both bricks of the
>> replica. If you write to a file, the write is also sent to both bricks.
>> This is how it works. Only reads are served from the local brick.
>> -Ravi
>>
>>
>>
>>  If I add a static route to break connectivity to sto02 and do a "df", I
>> have around 30s before it works.
>> Then it works ok.
>>
>>  Questions:
>>
>>    - How to force node to stick as possible with one specific (local)
>>    node ?
>>    - How to know where a client is currently connected?
>>
>> Thanks for your help :)
>>
>>
>>  Cordialement,
>> Mathieu CHATEAU
>> http://www.lotp.fr
>>
>> 2015-05-11 7:26 GMT+02:00 Mathieu Chateau <mathieu.chateau at lotp.fr>:
>>
>>> Hello,
>>>
>>>  thanks for helping :)
>>>
>>>  If gluster server is rebooted, any way to make client failback on node
>>> after reboot ?
>>>
>>>  How to know which node is using a client ? I see TCP connection to
>>> both node
>>>
>>>  Regards,
>>>
>>>  Cordialement,
>>> Mathieu CHATEAU
>>> http://www.lotp.fr
>>>
>>> 2015-05-11 7:13 GMT+02:00 Ravishankar N <ravishankar at redhat.com>:
>>>
>>>>
>>>>
>>>> On 05/10/2015 08:29 PM, Mathieu Chateau wrote:
>>>>
>>>> Hello,
>>>>
>>>>  Short way: Is there any way to define a preferred Gluster server ?
>>>>
>>>>  Long way:
>>>> I have the following setup (version 3.6.3) :
>>>>
>>>>  Gluster A  <==> VPN <==> Gluster B
>>>>
>>>>  Volume is replicated between A and B.
>>>>
>>>>  They are in same datacenter, using a 1Gb/s connection, low latency
>>>> (0.5ms)
>>>>
>>>>  I have gluster clients in lan A & B.
>>>>
>>>>  When doing a "ls" on big folder (~60k files), both gluster node are
>>>> used, and so it need 9mn instead on 1mn if only the local gluster is
>>>> reachable.
>>>>
>>>>
>>>>  Lookups (and writes of course) from clients are sent to both  bricks
>>>> because AFR uses the result of the lookup to select which brick to read
>>>> from if there is a pending heal etc.
>>>> If the file is clean on both A and B, then reads are always served from
>>>> the local brick. i.e. reads on clients mounted on A will be served from the
>>>> brick in A (and likewise for B).
>>>>
>>>> Hope that helps,
>>>> Ravi
>>>>
>>>>
>>>>   It's HA setup, application is present on both side. I would like a
>>>> master/master setup, but using only local node as possible.
>>>>
>>>>
>>>>  Regards,
>>>> Mathieu CHATEAU
>>>> http://www.lotp.fr
>>>>
>>>>
>>>>  _______________________________________________
>>>> Gluster-users mailing listGluster-users at gluster.orghttp://www.gluster.org/mailman/listinfo/gluster-users
>>>>
>>>>
>>>>
>>>
>>
>>
>
>
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