I believe that -1 is "special", in that all -1’s are different form each other.
So you will wind up with data on several -1 NSDs, instead of a -1 and a 2.
In fact you probably didn’t specify -1, it was likely assigned automatically.
Read the first paragraph in the failureGroup entry in:
https://www.ibm.com/support/knowledgecenter/en/STXKQY_5.0.2/com.ibm.spectrum.scale.v5r02.doc/bl1adm_mmcrnsd.htm
<https://www.ibm.com/support/knowledgecenter/en/STXKQY_5.0.2/com.ibm.spectrum.scale.v5r02.doc/bl1adm_mmcrnsd.htm>
I do realize that the subsequent paragraphs do confuse the issue somewhat, but
the first paragraph describes what’s happening.
Liberty,
--
Stephen
> On Apr 16, 2019, at 8:38 AM, Prasad Surampudi
> <[email protected] <mailto:[email protected]>>
> wrote:
>
> We have a filesystem with 'system' and 'v7kdata' pools. All the NSDs in
> v7kdata are with failure group '-1'. Filesystem metadata is already
> replicated. Now we are planning to replicate the filesystem data. So, If I
> add new NSDs with failure group '2' in the v7kdata pool, would I be able to
> replicate GPFS data between NSDs with '-1' failure group and NSDs with
> failure group '2' ? i.e have one copy of file on NSD with '-1' and another
> copy on NSD with failure group '2' ? or Do I have to change the NSDs with
> failure group '-1' to '1' ?
>
>
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