1143753 – LVM cache: 'lvs' is unable to print the cachemode

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Bug 1143753 - LVM cache: 'lvs' is unable to print the cachemode

Summary: LVM cache: 'lvs' is unable to print the cachemode

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	lvm2
Sub Component:
Version:	7.1
Hardware:	Unspecified
OS:	Unspecified
Priority:	unspecified
Severity:	unspecified
Target Milestone:	rc
Target Release:	---
Assignee:	David Teigland
QA Contact:	Cluster QE
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:	1119326
TreeView+	depends on / blocked

Reported:	2014-09-17 22:18 UTC by Jonathan Earl Brassow
Modified:	2021-09-03 12:36 UTC (History)
CC List:	7 users (show)
Fixed In Version:	lvm2-2.02.112-1.el7
Doc Type:	Bug Fix
Doc Text:	No Documentation Needed
Clone Of:
Environment:
Last Closed:	2015-03-05 13:09:30 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)
broken patch (6.62 KB, patch) 2014-09-17 22:19 UTC, Jonathan Earl Brassow	no flags	Details \| Diff
View All

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2015:0513	0	normal	SHIPPED_LIVE	lvm2 bug fix and enhancement update	2015-03-05 16:14:41 UTC

Description Jonathan Earl Brassow 2014-09-17 22:18:38 UTC

It is possible to set a cachepool to use "writeback" or "writethrough" cache mode, but it is not possible to get that information from 'lvs' (e.g. 'lvs -o cachemode').

Comment 1 Jonathan Earl Brassow 2014-09-17 22:19:54 UTC

Created attachment 938655 [details]
broken patch

here is an untested and partially written patch for this issue.  If it is helpful to you, great.

Comment 3 David Teigland 2014-10-02 16:40:11 UTC

pushed to git
https://git.fedorahosted.org/cgit/lvm2.git/commit/?id=17ab39f7431fdad4c8a445bd1e78a288eeb64bc1

Comment 4 David Teigland 2014-10-02 16:56:47 UTC

    cache: include cache mode in vg metadata and display
    
    The cache mode of a new cache pool is always explicitly
    included in the vg metadata.  If a cache mode is not
    specified on the command line, the cache mode is taken
    from lvm.conf allocation/cache_pool_cachemode, which
    defaults to "writethrough".
    
    The cache mode can be displayed with lvs -o+cachemode.

Comment 6 Corey Marthaler 2015-01-22 22:00:16 UTC

Fixed verified in the latest rpms.

3.10.0-223.el7.x86_64
lvm2-2.02.115-2.el7    BUILT: Thu Jan 22 06:09:14 CST 2015
lvm2-libs-2.02.115-2.el7    BUILT: Thu Jan 22 06:09:14 CST 2015
lvm2-cluster-2.02.115-2.el7    BUILT: Thu Jan 22 06:09:14 CST 2015
device-mapper-1.02.93-2.el7    BUILT: Thu Jan 22 06:09:14 CST 2015
device-mapper-libs-1.02.93-2.el7    BUILT: Thu Jan 22 06:09:14 CST 2015
device-mapper-event-1.02.93-2.el7    BUILT: Thu Jan 22 06:09:14 CST 2015
device-mapper-event-libs-1.02.93-2.el7    BUILT: Thu Jan 22 06:09:14 CST 2015
device-mapper-persistent-data-0.4.1-2.el7    BUILT: Wed Nov 12 12:39:46 CST 2014
cmirror-2.02.115-2.el7    BUILT: Thu Jan 22 06:09:14 CST 2015



# WRITETHROUGH
lvcreate -L 4G -n corigin cache_sanity /dev/sde1
lvcreate -L 2G -n display_cache cache_sanity /dev/sdd1
lvcreate -L 12M -n display_cache_meta cache_sanity /dev/sdd1
lvconvert --yes --type cache-pool --cachemode writethrough -c 64 --poolmetadata cache_sanity/display_cache_meta cache_sanity/display_cache
lvconvert --yes --type cache --cachepool cache_sanity/display_cache cache_sanity/corigin
[root@host-114 ~]# lvs -a -o +devices,cachemode
 LV                    Attr       LSize   Pool            Origin          Data% Meta% Cpy%Sync Devices                Cachemode
 corigin               Cwi-a-C---   4.00g [display_cache] [corigin_corig] 0.02  2.31  0.00     corigin_corig(0)       writethrough
 [corigin_corig]       owi-aoC---   4.00g                                                      /dev/sde1(0)
 [display_cache]       Cwi---C---   2.00g                                 0.02  2.31  0.00     display_cache_cdata(0) writethrough
 [display_cache_cdata] Cwi-ao----   2.00g                                                      /dev/sdd1(0)
 [display_cache_cmeta] ewi-ao----  12.00m                                                      /dev/sdd1(512)
 [lvol0_pmspare]       ewi-------  12.00m                                                      /dev/sdb1(0)



# WRITEBACK
lvcreate -L 4G -n corigin cache_sanity /dev/sdb1
lvcreate -L 2G -n display_cache cache_sanity /dev/sdc1
lvcreate -L 12M -n display_cache_meta cache_sanity /dev/sdc1
lvconvert --yes --type cache-pool --cachemode writeback -c 32 --poolmetadata cache_sanity/display_cache_meta cache_sanity/display_cache
lvconvert --yes --type cache --cachepool cache_sanity/display_cache cache_sanity/corigin
[root@host-114 ~]# lvs -a -o +devices,cachemode
 LV                    Attr       LSize   Pool            Origin          Data% Meta% Cpy%Sync Devices                Cachemode
 corigin               Cwi-a-C---   4.00g [display_cache] [corigin_corig] 0.01  4.39  0.00     corigin_corig(0)       writeback
 [corigin_corig]       owi-aoC---   4.00g                                                      /dev/sdb1(0)
 [display_cache]       Cwi---C---   2.00g                                 0.01  4.39  0.00     display_cache_cdata(0) writeback
 [display_cache_cdata] Cwi-ao----   2.00g                                                      /dev/sdc1(0)
 [display_cache_cmeta] ewi-ao----  12.00m                                                      /dev/sdc1(512)
 [lvol0_pmspare]       ewi-------  12.00m                                                      /dev/sdb1(1024)

Comment 8 errata-xmlrpc 2015-03-05 13:09:30 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0513.html

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