Hi, all:
I meet a requirement in my OpenStack environment which initially uses
one LVMISCSI backend. Along with the usage, the storage is insufficient, so I
want to add a NFS backend to the exists Cinder.
There is only a single Cinder-volume in environment, so I need to
configure the Cinder to use "multi-backend", which means the initial LVMISCSI
storage and the new added NFS storage are both used as the backend. However,
the existing volume on initial LVMISCSI backend will not be handled normally
after using multi-backend, because the "host" of the exists volume will be
thought down.
I know that the "migrate" and "retype" APIs aim to handle the "backend
capacity expansion", however, each of them can't used for this situation.
I think the use case above is common in production environment. Is
there some existing method can achieve it ? Currently, I manually updated the
"host" value of the existing volumes in database, and the existing volumes can
then be handled normally.
Thanks.
----------
zhangleiqiang (Trump)
Best Regards
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