Bug 1286283

Summary: dmstats: support non-dm devices for stats create
Product: Red Hat Enterprise Linux 7 Reporter: Bryn M. Reeves <bmr>
Component: lvm2Assignee: Bryn M. Reeves <bmr>
lvm2 sub component: libdevmapper QA Contact: cluster-qe <cluster-qe>
Status: CLOSED DUPLICATE Docs Contact:
Severity: unspecified    
Priority: unspecified CC: agk, heinzm, jbrassow, msnitzer, prajnoha, prockai, zkabelac
Version: 7.2   
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2016-12-21 20:55:16 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Bryn M. Reeves 2015-11-27 18:09:42 UTC 
Description of problem:
Device-mapper IO statistics can be used with any block device providing a dm-linear layer is mapped over the underlying device, e.g.:

# dmsetup create sda --table="0 2048 linear 8:0"
# dmstats create sda
# < ... do stuff ... >
# dmstats delete sda
# dmsetup remove sda

Doing so is tedious and requires the user to have knowledge of device-mapper targets and table syntax.

By providing the ability to automatically create the linear map when required (and when the requested device is idle) the use of device-mapper statistics with non device-mapper devices is considerably simplified.

Version-Release number of selected component (if applicable):
lvm2-2.02.127-*.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. dmstats create /dev/sda

Actual results:
# dmstats create /dev/sda
Device sda not found
Command failed

Expected results:
* creates dm device "sda"
* registers requested stats regions on dm device "sda" 

Additional info:
Comment 2 Jonathan Earl Brassow 2016-12-21 20:55:16 UTC 

*** This bug has been marked as a duplicate of bug 1286282 ***