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Bug 1876811 - lvm attempts to resize a cached thinpool repeatedly
Summary: lvm attempts to resize a cached thinpool repeatedly
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: lvm2
Version: 7.6
Hardware: Unspecified
OS: Unspecified
unspecified
medium
Target Milestone: rc
: ---
Assignee: Zdenek Kabelac
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-09-08 08:49 UTC by nikhil kshirsagar
Modified: 2023-12-15 19:12 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-11-11 21:42:14 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description nikhil kshirsagar 2020-09-08 08:49:21 UTC 
Description of problem:
Fill a cached thinpool to about 73% and have autoextend off in lvm.conf

The kernel messages indicate that resize is attempted on the cached thinpool, though the threshold isn't reached.


Version-Release number of selected component (if applicable):
RHEL 7.6
lvm2-2.02.180-10.el7_6.3.x86_64


Steps to Reproduce:

[root@vm252-122 ~]# vgcreate thinvg /dev/sdb /dev/sdc
  Volume group "thinvg" successfully created

[root@vm252-122 ~]# lvcreate --yes --type thin-pool -n pool -l 100%FREE thinvg
  Thin pool volume with chunk size 64.00 KiB can address at most 15.81 TiB of data.
  Logical volume "pool" created.

[root@vm252-122 ~]# lvcreate --yes -V 10G -n thin1 thinvg/pool
  WARNING: Sum of all thin volume sizes (10.00 GiB) exceeds the size of thin pool thinvg/pool and the size of whole volume group (1.99 GiB).
  WARNING: You have not turned on protection against thin pools running out of space.
  WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full.
  Logical volume "thin1" created.

[root@vm252-122 ~]# mkfs.xfs /dev/thinvg/thin1
meta-data=/dev/thinvg/thin1      isize=512    agcount=16, agsize=163840 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=2621440, imaxpct=25
         =                       sunit=16     swidth=16 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=16 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0


[root@vm252-122 ~]# vgextend thinvg /dev/sdd
  Volume group "thinvg" successfully extended
[root@vm252-122 ~]# lvcreate --yes -L 100M -n cachemeta_lv thinvg /dev/sdd
  WARNING: Sum of all thin volume sizes (20.00 GiB) exceeds the size of thin pools and the size of whole volume group (<2.99 GiB).
  WARNING: You have not turned on protection against thin pools running out of space.
  WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full.
  Logical volume "cachemeta_lv" created.
[root@vm252-122 ~]# lvcreate --yes -l 80%PV -n cache_lv thinvg /dev/sdd
  WARNING: Sum of all thin volume sizes (20.00 GiB) exceeds the size of thin pools and the size of whole volume group (<2.99 GiB).
  WARNING: You have not turned on protection against thin pools running out of space.
  WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full.
  Logical volume "cache_lv" created.
[root@vm252-122 ~]# lvconvert --yes --cachemode writeback --type cache-pool --poolmetadata thinvg/cachemeta_lv thinvg/cache_lv
  WARNING: Converting thinvg/cache_lv and thinvg/cachemeta_lv to cache pool's data and metadata volumes with metadata wiping.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
  Converted thinvg/cache_lv and thinvg/cachemeta_lv to cache pool.
[root@vm252-122 ~]#  lvconvert --yes --cachepool thinvg/cache_lv --type cache thinvg/pool
  WARNING: Cached thin pool's data cannot be currently resized and require manual uncache before resize!
  Logical volume thinvg/pool_tdata is now cached.
[root@vm252-122 ~]# date
Tue Sep  8 04:17:56 EDT 2020
[root@vm252-122 ~]# lvs
  LV    VG             Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root  rhel_vm252-122 -wi-ao---- <8.00g                                                    
  swap  rhel_vm252-122 -wi-ao----  1.00g                                                    
  pool  thinvg         twi-aotz--  1.98g             1.10   11.13                           
  thin1 thinvg         Vwi-a-tz-- 10.00g pool        0.11                                   
  thin2 thinvg         Vwi-a-tz-- 10.00g pool        0.11                                   
[root@vm252-122 ~]# tail -f /var/log/messages
Sep  8 04:02:04 vm252-122 lvm[8915]: Unable to resize logical volumes of cache type.
Sep  8 04:02:04 vm252-122 lvm[8915]: Failed command for thinvg-pool-tpool.
Sep  8 04:16:05 vm252-122 lvm[8915]: No longer monitoring thin pool othervg-otherpool-tpool.
Sep  8 04:16:14 vm252-122 kernel: XFS (dm-6): Unmounting Filesystem
Sep  8 04:16:21 vm252-122 dmeventd[8915]: No longer monitoring thin pool thinvg-pool-tpool.
Sep  8 04:17:01 vm252-122 lvm[8915]: Monitoring thin pool thinvg-pool.
Sep  8 04:17:09 vm252-122 dmeventd[8915]: No longer monitoring thin pool thinvg-pool.
Sep  8 04:17:09 vm252-122 lvm[8915]: Monitoring thin pool thinvg-pool-tpool.
Sep  8 04:17:49 vm252-122 dmeventd[8915]: No longer monitoring thin pool thinvg-pool-tpool.
Sep  8 04:17:49 vm252-122 lvm[8915]: Monitoring thin pool thinvg-pool-tpool.

fill the pool to about 70% 

[root@vm252-122 ~]# mount /dev/thinvg/thin1 /home/nkshirsa/formount/
[root@vm252-122 ~]# dd if=/dev/urandom of=/home/nkshirsa/formount/file1 bs=1M count=1500
1500+0 records in
1500+0 records out
1572864000 bytes (1.6 GB) copied, 7.96618 s, 197 MB/s
[root@vm252-122 ~]# lvs
  LV    VG             Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root  rhel_vm252-122 -wi-ao---- <8.00g                                                    
  swap  rhel_vm252-122 -wi-ao----  1.00g                                                    
  pool  thinvg         twi-aotz--  1.98g             74.92  27.64                           
  thin1 thinvg         Vwi-aotz-- 10.00g pool        14.76                                  
  thin2 thinvg         Vwi-a-tz-- 10.00g pool        0.11                                   
[root@vm252-122 ~]# cat /etc/lvm/lvm.conf | grep autoextend | grep -v "#"
	snapshot_autoextend_threshold = 100
	snapshot_autoextend_percent = 20
	thin_pool_autoextend_threshold = 100
	thin_pool_autoextend_percent = 20
[root@vm252-122 ~]# date
Tue Sep  8 04:28:33 EDT 2020


messages tailed show this.

Sep  8 04:28:39 vm252-122 lvm[8915]: Unable to resize logical volumes of cache type.
Sep  8 04:28:39 vm252-122 lvm[8915]: Failed command for thinvg-pool-tpool.
Sep  8 04:29:29 vm252-122 lvm[8915]: Unable to resize logical volumes of cache type.
Sep  8 04:29:29 vm252-122 lvm[8915]: Failed command for thinvg-pool-tpool.
Sep  8 04:30:59 vm252-122 lvm[8915]: Unable to resize logical volumes of cache type.
Sep  8 04:30:59 vm252-122 lvm[8915]: Failed command for thinvg-pool-tpool.


---------------------------------
Comment 6 Chris Williams 2020-11-11 21:42:14 UTC 
Red Hat Enterprise Linux 7 shipped it's final minor release on September 29th, 2020. 7.9 was the last minor releases scheduled for RHEL 7.
From intial triage it does not appear the remaining Bugzillas meet the inclusion criteria for Maintenance Phase 2 and will now be closed. 

From the RHEL life cycle page:
https://access.redhat.com/support/policy/updates/errata#Maintenance_Support_2_Phase
"During Maintenance Support 2 Phase for Red Hat Enterprise Linux version 7,Red Hat defined Critical and Important impact Security Advisories (RHSAs) and selected (at Red Hat discretion) Urgent Priority Bug Fix Advisories (RHBAs) may be released as they become available."

If this BZ was closed in error and meets the above criteria please re-open it flag for 7.9.z, provide suitable business and technical justifications, and follow the process for Accelerated Fixes:
https://source.redhat.com/groups/public/pnt-cxno/pnt_customer_experience_and_operations_wiki/support_delivery_accelerated_fix_release_handbook  

Feature Requests can re-opened and moved to RHEL 8 if the desired functionality is not already present in the product. 

Please reach out to the applicable Product Experience Engineer[0] if you have any questions or concerns.  

[0] https://bugzilla.redhat.com/page.cgi?id=agile_component_mapping.html&product=Red+Hat+Enterprise+Linux+7
Comment 7 Zdenek Kabelac 2021-02-09 11:54:58 UTC 
Full support added upstream and resolved via bug 1899720 for RH8.
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