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Re: [lvm-devel] [PATCH] Never scan internal LVM devices.



ACK. - many bugs are caused by this issue.

On Aug 4, 2010, at 10:51 AM, Petr Rockai wrote:

Even if a PV was stacked in an LV, and this LV was composite (so it is
using some internal LVs as its components), it is desirable that this
*and only* this composite LV is seen by LVM as a PV. If the PV label or MDA is propagated into the component LVs (such as mimages) and these are
found during a scan, this would lead to the PV being found multiple
times which is certainly undesirable. Cf. the situation with MD
component devices, which is analogous.

... and we have seen these cases when trying to stack VGs (e.g. a mirrored LV that forms the base of another VG).

 brassow


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