Re: [MooseFS-Users] Question about connecting from moosefs client 3.086 to 3.077

[Aleksander W. <ale...@mo...>]

Hi,
Basically there is no issue.
You can use MooseFS Master 3.0.86 with MooseFS chunkserver 3.0.82 and
MooseFS client 3.0.86, but _*never*_ use older master and newer
chunkservers and clients.

Chunkserver in latest version will create chunks with new 8k header.
When you downgrade chunkserver from 3.0.83 to older version, chunkserver
will not recognize chunks with 8k header and mark them as broken.

From the other side, why you want to use such a mixed configuration?
We always suggest to use the same software version(latest) in whole
MooseFS Cluster.

Best regards
Aleksander Wieliczko
Technical Support Engineer
MooseFS.com <moosefs.com>

On 12/05/2016 05:43 PM, web user wrote:
> I have a new user connecting to my moosefs master from macosx. While
> getting his env setup I saw the following error message:
>
> If you already upgraded your Chunkservers to v. 3.0.83 or higher,
> please DO NOTdowngrade them!
>
> In MooseFS Chunkserver v. 3.0.83 we changed Chunk header from 5k to 8k
> (seechangelog
> <https://moosefs.com/documentation/changes-in-moosefs-3-0.html>) - it
> means, that Chunkserver older than 3.0.83 cannot "understand" new
> Chunk header, which may lead to potential data loss!
>
>
> Does that only apply to the chunk servers. Is there any issue with him
> connecting with mfs client (> 3.83) to a mfs chunk server (<3.83)?
>