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Bug 1846332

Summary: metadata corrupted by double activation , cannot be repaired with repair tools
Product: Red Hat Enterprise Linux 7 Reporter: nikhil kshirsagar <nkshirsa>
Component: lvm2Assignee: LVM and device-mapper development team <lvm-team>
lvm2 sub component: Thin Provisioning QA Contact: cluster-qe <cluster-qe>
Status: CLOSED NOTABUG Docs Contact:
Severity: unspecified    
Priority: unspecified CC: agk, heinzm, jbrassow, msnitzer, prajnoha, thornber, zkabelac
Version: 7.8   
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-06-12 09:46:13 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
Packed metadata tp_64
none
Packed metadata tp_6a none

Comment 3 Joe Thornber 2020-06-11 12:10:45 UTC 
Created attachment 1696744 [details]
Packed metadata tp_64

Packed version of the metadata.  Use thin_metadata_unpack to expand.
Comment 4 Joe Thornber 2020-06-11 12:13:12 UTC 
Created attachment 1696745 [details]
Packed metadata tp_6a

Use thin_metadata_unpack to expand.
Comment 6 Joe Thornber 2020-06-12 09:46:13 UTC 
I've looked at the metadata.  The superblock is inconsistent, which indicates concurrent activation of the pool on multiple machines/vms.  Typically we can recover from this, but in this case other metadata has been overwritten.  This strongly suggests the pool is actually being used on different machines/vms (ie. IO is going to the thins).

I can recover most of the metadata for tp_64..., but I know ~2000 mappings are missing for thin_dev 2.  As yet I haven't been able to recover anything for tp_6a, and am going to stop trying.

I'm closing the bz as thin has been used incorrectly.  It is not cluster aware, activating on multiple machines is akin to trying to mount a filesystem on multiple machines at the same time.