Red Hat Bugzilla – Bug 1305573
[RFE] Add support for OPTIONAL PV
Last modified: 2016-02-08 10:40:03 EST
Description of problem:
Introduce support for new PV type.
ATM lvm2 does support PERMANENT PVs - if such PV is missing, it's causing error reports in lvm2 command.
We would like to support OPTIONAL PVs - such a PV could be available, but when when it's missing it's the correct state - it's 'another kind of' MISSING handling. The limitation is - there must be always at least 1 PERMANENT PV in a VG to hold all the metadata.
Such optional PV does not hold metadata.
Also it's based on previous work of supporting new PV flag pv-in-use.
Example of use case:
Having multiple nodes - accessing clustered VG on all nodes, but then nodes may use local devices as well - e.g. local SSD storage user may want to use for caching.
Other use case could be attaching optional PV as USB as a member of VG.
Version-Release number of selected component (if applicable):
Steps to Reproduce: