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xen-users
RE: [Xen-users] XCP - GFS - ISCSI
Hi Pasi,
[cc:d Julian who is responsible for storage in XCP]
> I haven't looked at the XCP code yet, but are there some special
> patches for
> LVM to make it work in a shared environment on multiple hosts?
>
> I guess it's not CLVM, since you support snapshots.. so xapi is doing
> some coordination of management commands and making sure only one LVM
> command is issued at a time?
Julian could describe the detail better than me but my high-level understanding
is:
* xapi nominates one host to be the 'SR master': all LVM metadata-changing
commands are run here
* all hosts are allowed to map/unmap LVs so the LVM commands were patched to
make absolutely sure they didn't attempt to change any metadata
* unless you request a special "raw" LV, vhd metadata is added to the LV: this
is how we handle snapshots
> And after making changes to the LVM configuration xapi runs 'vgscan' on
> every host to pick up the changes?
I'll defer to Julian for this one :-)
Cheers,
Dave
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