Bug 1637121

Summary: RFE: Increase default size of pool metadata area
Product: Red Hat Enterprise Linux 7 Reporter: Jonathan Earl Brassow <jbrassow>
Component: lvm2Assignee: Zdenek Kabelac <zkabelac>
lvm2 sub component: Thin Provisioning QA Contact: cluster-qe <cluster-qe>
Status: CLOSED DUPLICATE Docs Contact:
Severity: unspecified    
Priority: unspecified CC: agk, cmarthal, heinzm, jbrassow, msnitzer, prajnoha, rhandlin, thornber, zkabelac
Version: 7.7-AltKeywords: FutureFeature
Target Milestone: rc   
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Hardware: Unspecified   
OS: Unspecified   
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Last Closed: 2019-04-03 14:39:12 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Blocks: 1577173    

Description Jonathan Earl Brassow 2018-10-08 16:26:00 UTC 
We've seen a number of reports of people running out of metadata space.  It doesn't hurt us to be a little more generous in our metadata area allocation.

I realize that we have functions to grow the metadata space on the fly, but not everyone heeds the advice to keep some VG space in reserve for such situations.  We are not here to spite them - let's do them a favor.
Comment 6 Zdenek Kabelac 2019-04-03 14:39:12 UTC 
Will be resolved via Bug 1610260.

Metadata will automatically extended bigger when user extends thin-pool.

*** This bug has been marked as a duplicate of bug 1610260 ***
Comment 7 Corey Marthaler 2019-06-04 18:17:20 UTC 
For the record, even though this bug was marked a dup of bug 1610260, none of the four scenarios listed above to be tested in rhel7.7 changed at all. This bug should have just been closed WONTFIX if this is expected.

3.10.0-1048.el7.x86_64

lvm2-2.02.185-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
lvm2-libs-2.02.185-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-1.02.158-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-libs-1.02.158-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-event-1.02.158-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-event-libs-1.02.158-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-persistent-data-0.8.1-1.el7    BUILT: Sat May  4 14:53:53 CDT 2019


# Case 1 (100G Converted to pool LV)
[root@hayes-02 ~]# lvcreate -n ThinDataLV -L 100G test
  Logical volume "ThinDataLV" created.
[root@hayes-02 ~]# lvs -a -o +devices
  LV         VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert Devices     
  ThinDataLV test -wi-a----- 100.00g                                                     /dev/sdb1(0)
[root@hayes-02 ~]# lvconvert --type thin-pool test/ThinDataLV
  Thin pool volume with chunk size 64.00 KiB can address at most 15.81 TiB of data.
  WARNING: Converting test/ThinDataLV to thin pool's data volume with metadata wiping.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
Do you really want to convert test/ThinDataLV? [y/n]: y
  Converted test/ThinDataLV to thin pool.
[root@hayes-02 ~]# lvs -a -o +devices
  LV                 VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert Devices            
  ThinDataLV         test twi-a-tz-- 100.00g             0.00   10.43                            ThinDataLV_tdata(0)
  [ThinDataLV_tdata] test Twi-ao---- 100.00g                                                     /dev/sdb1(0)       
  [ThinDataLV_tmeta] test ewi-ao---- 100.00m                                                     /dev/sdb1(25600)   
  [lvol0_pmspare]    test ewi------- 100.00m                                                     /dev/sdb1(25625)   


# Case 2 (1G Converted to pool LV)
[root@hayes-02 ~]#  lvcreate -n ThinDataLV -L 1G test
  Logical volume "ThinDataLV" created.
[root@hayes-02 ~]# lvconvert --type thin-pool test/ThinDataLV
  Thin pool volume with chunk size 64.00 KiB can address at most 15.81 TiB of data.
  WARNING: Converting test/ThinDataLV to thin pool's data volume with metadata wiping.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
Do you really want to convert test/ThinDataLV? [y/n]: y
  Converted test/ThinDataLV to thin pool.
[root@hayes-02 ~]# lvs -a -o +devices
  LV                 VG   Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert Devices            
  ThinDataLV         test twi-a-tz-- 1.00g             0.00   10.94                            ThinDataLV_tdata(0)
  [ThinDataLV_tdata] test Twi-ao---- 1.00g                                                     /dev/sdb1(0)       
  [ThinDataLV_tmeta] test ewi-ao---- 4.00m                                                     /dev/sdb1(256)     
  [lvol0_pmspare]    test ewi------- 4.00m                                                     /dev/sdb1(257)     


# Case 3 (100G single lvcreate pool LV)
[root@hayes-02 ~]# lvcreate --thinpool ThinPool -L 100G test
  Thin pool volume with chunk size 64.00 KiB can address at most 15.81 TiB of data.
  Logical volume "ThinPool" created.
[root@hayes-02 ~]# lvs -a -o +devices
  LV               VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert Devices          
  ThinPool         test twi-a-tz-- 100.00g             0.00   10.43                            ThinPool_tdata(0)
  [ThinPool_tdata] test Twi-ao---- 100.00g                                                     /dev/sdb1(25)    
  [ThinPool_tmeta] test ewi-ao---- 100.00m                                                     /dev/sde1(0)     
  [lvol0_pmspare]  test ewi------- 100.00m                                                     /dev/sdb1(0)     


# Case 4 (1G single cmdline pool LV)
[root@hayes-02 ~]# lvcreate --thinpool ThinPool -L 1G test
  Thin pool volume with chunk size 64.00 KiB can address at most 15.81 TiB of data.
  Logical volume "ThinPool" created.
[root@hayes-02 ~]# lvs -a -o +devices
  LV               VG   Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert Devices          
  ThinPool         test twi-a-tz-- 1.00g             0.00   10.94                            ThinPool_tdata(0)
  [ThinPool_tdata] test Twi-ao---- 1.00g                                                     /dev/sdb1(1)     
  [ThinPool_tmeta] test ewi-ao---- 4.00m                                                     /dev/sde1(0)     
  [lvol0_pmspare]  test ewi------- 4.00m                                                     /dev/sdb1(0)