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Bug 1371597

Summary: DOCUMENTATION: cache volume extension doesn't work
Product: Red Hat Enterprise Linux 7 Reporter: Jonathan Earl Brassow <jbrassow>
Component: lvm2Assignee: Jonathan Earl Brassow <jbrassow>
lvm2 sub component: Cache Logical Volumes QA Contact: cluster-qe <cluster-qe>
Status: CLOSED CURRENTRELEASE Docs Contact: Steven J. Levine <slevine>
Severity: medium    
Priority: unspecified CC: agk, cluster-qe, cmarthal, heinzm, jbrassow, lmiksik, msnitzer, prajnoha, prockai, thornber, zkabelac
Version: 7.2Keywords: Documentation
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Release Note
Doc Text:
Support for caching thinly-provisioned logical volumes with limitations Red Hat Enterprise Linux 7.3 provides the ability to cache thinly provisioned logical volumes. This brings caching benefits to all the thin logical volumes associated with a particular thin pool. However, when thin pools are set up in this way, it is not currently possible to grow the thin pool without removing the cache layer first. This also means that thin pool auto-grow features are unavailable. Users should take care to monitor the fullness and consumption rate of their thin pools to avoid running out of space. Refer to the lvmthin(7) man page for information on thinly-provisioned logical volume and the lvmcache(7) man page for information on LVM cache volumes.
 Story Points: ---
Clone Of: 1251280 Environment:
Last Closed: 2016-09-19 21:06:17 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:
Bug Depends On: 1189111, 1233909, 1251280    
Bug Blocks:    

Comment 1 Jonathan Earl Brassow 2016-08-30 15:16:45 UTC 
Thin-pools are normally capable of auto-growing as they become full - preventing more serious issues when a pool completely fills.  This ability is unavailable when there is  a cache layer on top of the ThinDataLV.  Users must be notified of this limitation via a release note.
Comment 3 Jonathan Earl Brassow 2016-09-19 21:06:17 UTC 
Closing this bug now that the proper documentation is in the release notes.