Bug 2222959

Summary:	RFE: support conversion with zero and error segtypes
Product:	[Community] LVM and device-mapper	Reporter:	Zdenek Kabelac <zkabelac>
Component:	lvm2	Assignee:	Zdenek Kabelac <zkabelac>
lvm2 sub component:	Testing	QA Contact:	cluster-qe <cluster-qe>
Status:	POST ---	Docs Contact:
Severity:	low
Priority:	unspecified	CC:	agk, heinzm, jbrassow, msnitzer, prajnoha, zkabelac
Version:	unspecified	Flags:	pm-rhel: lvm-technical-solution? pm-rhel: lvm-test-coverage?
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Description Zdenek Kabelac 2023-07-14 15:38:28 UTC

Description of problem:

For testing purposed it might be occasionally useful to play with LVs that have 'zero' or 'error' segtype. 

Possible usecases:

lvcreate -L1000G --type zero -n lvname  vgname

lvconvert --thinpool vgname/lvname

or

lvconvert --thin  vgname/lvname

lvconvert --cachepool vgname/lvname


Allows to quickly create a thin volume with any size - that has *NO REAL* space used for backend - so clearly not usable to story *ANY REAL* data - but allow to check various performance characteristics of thin  or cache targets.

Comment 1 Zdenek Kabelac 2023-07-14 15:39:53 UTC

Mostly implemented upstream within version 2.03.22.