RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1348336 - full thin pool now allows additional virt volume creation
Summary: full thin pool now allows additional virt volume creation
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: lvm2
Version: 7.3
Hardware: x86_64
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Zdenek Kabelac
QA Contact: cluster-qe@redhat.com
Milan Navratil
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-06-20 20:54 UTC by Corey Marthaler
Modified: 2021-09-03 12:49 UTC (History)
9 users (show)

Fixed In Version: lvm2-2.02.165-3.el7
Doc Type: Release Note
Doc Text:
The thin pool is now always checked for sufficient space when creating a new thin volume Even when the user does not use autoresize with thin pool monitoring, the thin pool is now always checked for sufficient space when creating a new thin volume. A new thin volumes now cannot be created in the following situations: * The thin-pool has reached 100% of the data volume capacity. * There is less than 25% of thin pool metadata free space for metadata smaller than 16 MiB. * There is less than 4 MiB of free space in metadata.
Clone Of:
Environment:
Last Closed: 2016-11-04 04:21:54 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2016:1445 0 normal SHIPPED_LIVE lvm2 bug fix and enhancement update 2016-11-03 13:46:41 UTC

Description Corey Marthaler 2016-06-20 20:54:51 UTC 
Description of problem:
[root@host-083 ~]# lvs -a -o +devices
  LV              Attr       LSize Pool Origin Data%  Meta%  Devices
  POOL            twi-aot-D- 1.00g             100.00 14.65  POOL_tdata(0)
  [POOL_tdata]    Twi-ao---- 1.00g                           /dev/sdb1(1)
  [POOL_tmeta]    ewi-ao---- 4.00m                           /dev/sdf1(0)
  full_snap       Vwi-aot--- 2.00g POOL origin 49.98
  [lvol0_pmspare] ewi------- 4.00m                           /dev/sdb1(0)
  origin          Vwi-a-t--- 2.00g POOL        3.20
  other1          Vwi-a-t--- 2.00g POOL        0.00
  other2          Vwi-a-t--- 2.00g POOL        0.00
  other3          Vwi-a-t--- 2.00g POOL        0.00
  other4          Vwi-a-t--- 2.00g POOL        0.00
  other5          Vwi-a-t--- 2.00g POOL        0.00
  other6          Vwi-a-t--- 1.00g POOL        0.00
  other7          Vwi-a-t--- 1.00g POOL        0.00
  other8          Vwi-a-t--- 1.00g POOL        0.00


[root@host-083 ~]# lvcreate  -V 1G -T snapper_thinp/POOL -n other9
  WARNING: Sum of all thin volume sizes (18.00 GiB) exceeds the size of thin pool snapper_thinp/POOL (1.00 GiB)!
  For thin pool auto extension activation/thin_pool_autoextend_threshold should be below 100.
  /dev/snapper_thinp/other9: write failed after 0 of 4096 at 0: Input/output error
  Logical volume "other9" created.
[root@host-083 ~]# echo $?
0

# This is the expected behavior:
lvcreate  -V 1G -T snapper_thinp/POOL -n other9
  WARNING: Sum of all thin volume sizes (15.00 GiB) exceeds the size of thin pool snapper_thinp/POOL (1.00 GiB)!
  Free space in pool snapper_thinp/POOL is above threshold, new volumes are not allowed.


[root@host-083 ~]# lvs -a -o +devices
  LV              Attr       LSize Pool Origin Data%  Meta%  Devices
  POOL            twi-aot-D- 1.00g             100.00 14.75  POOL_tdata(0)
  [POOL_tdata]    Twi-ao---- 1.00g                           /dev/sdb1(1)
  [POOL_tmeta]    ewi-ao---- 4.00m                           /dev/sdf1(0)
  full_snap       Vwi-aot--- 2.00g POOL origin 49.98
  [lvol0_pmspare] ewi------- 4.00m                           /dev/sdb1(0)
  origin          Vwi-a-t--- 2.00g POOL        3.20
  other1          Vwi-a-t--- 2.00g POOL        0.00
  other2          Vwi-a-t--- 2.00g POOL        0.00
  other3          Vwi-a-t--- 2.00g POOL        0.00
  other4          Vwi-a-t--- 2.00g POOL        0.00
  other5          Vwi-a-t--- 2.00g POOL        0.00
  other6          Vwi-a-t--- 1.00g POOL        0.00
  other7          Vwi-a-t--- 1.00g POOL        0.00
  other8          Vwi-a-t--- 1.00g POOL        0.00
  other9          Vwi-a-t--- 1.00g POOL        0.00


[root@host-083 ~]# dmsetup status
snapper_thinp-origin: 0 4194304 thin 134400 4194303
snapper_thinp-other9: 0 2097152 thin 0 -
snapper_thinp-other8: 0 2097152 thin 0 -
snapper_thinp-POOL: 0 2097152 linear 
snapper_thinp-other7: 0 2097152 thin 0 -
snapper_thinp-other6: 0 2097152 thin 0 -
snapper_thinp-other5: 0 4194304 thin 128 127
snapper_thinp-other4: 0 4194304 thin 128 127
snapper_thinp-other3: 0 4194304 thin 128 127
snapper_thinp-POOL-tpool: 0 2097152 thin-pool 11 151/1024 16384/16384 - out_of_data_space no_discard_passdown error_if_no_space - 
snapper_thinp-POOL_tdata: 0 2097152 linear 
snapper_thinp-other2: 0 4194304 thin 128 127
snapper_thinp-full_snap: 0 4194304 thin 2096128 4194303
snapper_thinp-POOL_tmeta: 0 8192 linear 
snapper_thinp-other1: 0 4194304 thin 128 127


Version-Release number of selected component (if applicable):
3.10.0-419.el7.x86_64

lvm2-2.02.156-1.el7    BUILT: Mon Jun 13 03:05:51 CDT 2016
lvm2-libs-2.02.156-1.el7    BUILT: Mon Jun 13 03:05:51 CDT 2016
lvm2-cluster-2.02.156-1.el7    BUILT: Mon Jun 13 03:05:51 CDT 2016
device-mapper-1.02.126-1.el7    BUILT: Mon Jun 13 03:05:51 CDT 2016
device-mapper-libs-1.02.126-1.el7    BUILT: Mon Jun 13 03:05:51 CDT 2016
device-mapper-event-1.02.126-1.el7    BUILT: Mon Jun 13 03:05:51 CDT 2016
device-mapper-event-libs-1.02.126-1.el7    BUILT: Mon Jun 13 03:05:51 CDT 2016
device-mapper-persistent-data-0.6.2-0.1.rc8.el7    BUILT: Wed May  4 02:56:34 CDT 2016
cmirror-2.02.156-1.el7    BUILT: Mon Jun 13 03:05:51 CDT 2016
sanlock-3.3.0-1.el7    BUILT: Wed Feb 24 09:52:30 CST 2016
sanlock-lib-3.3.0-1.el7    BUILT: Wed Feb 24 09:52:30 CST 2016
lvm2-lockd-2.02.156-1.el7    BUILT: Mon Jun 13 03:05:51 CDT 2016


How reproducible:
Everytime
Comment 3 Zdenek Kabelac 2016-09-19 12:57:35 UTC 
Through these upstream patches:

https://www.redhat.com/archives/lvm-devel/2016-September/msg00048.html
https://www.redhat.com/archives/lvm-devel/2016-September/msg00047.html


there was introduced new 'wanted' behavior - where lvm2 more protects users from ruining their thin-pools via lvm2 commands.

Now there is a strict 'rule' - either there is 25% of metadata volume free (for thin metadata volumes below 16MiB in size) or there is at least 4MiB of free space otherwise. This rule also 'out-rules' any user-threshold settings (i.e. user may preset 99% threshold value - yet this rule above has higher priority).

When thin pool metadata free space is not within this 'restricted' limit - new thin-volumes shell not possible to create.
Comment 5 Corey Marthaler 2016-09-21 21:02:15 UTC 
New thin virt volumes no longer allowed to be created when pool is full.  Marking verified in the latest rpms.


3.10.0-501.el7.x86_64
lvm2-2.02.165-3.el7    BUILT: Wed Sep 21 08:26:18 CDT 2016
lvm2-libs-2.02.165-3.el7    BUILT: Wed Sep 21 08:26:18 CDT 2016
lvm2-cluster-2.02.165-3.el7    BUILT: Wed Sep 21 08:26:18 CDT 2016
device-mapper-1.02.134-3.el7    BUILT: Wed Sep 21 08:26:18 CDT 2016
device-mapper-libs-1.02.134-3.el7    BUILT: Wed Sep 21 08:26:18 CDT 2016
device-mapper-event-1.02.134-3.el7    BUILT: Wed Sep 21 08:26:18 CDT 2016
device-mapper-event-libs-1.02.134-3.el7    BUILT: Wed Sep 21 08:26:18 CDT 2016
device-mapper-persistent-data-0.6.3-1.el7    BUILT: Fri Jul 22 05:29:13 CDT 2016



[root@host-119 ~]# lvs -a -o +devices
  LV              Attr         LSize Pool Origin Data%  Meta% Devices
  POOL            twi-aot-D-   1.00g             100.00 14.45 POOL_tdata(0)
  [POOL_tdata]    Twi-ao----   1.00g                          /dev/sdc1(1)
  [POOL_tmeta]    ewi-ao----   4.00m                          /dev/sde1(0)
  full_snap       Vwi-aot---   2.00g POOL origin 49.97
  [lvol0_pmspare] ewi-------   4.00m                          /dev/sdc1(0)
  origin          Vwi-a-t---   2.00g POOL        3.20
  other1          Vwi-a-t---   2.00g POOL        0.00
  other2          Vwi-a-t---   2.00g POOL        0.00
  other3          Vwi-a-t---   2.00g POOL        0.00
  other4          Vwi-a-t---   2.00g POOL        0.00
  other5          Vwi-a-t---   2.00g POOL        0.00

[root@host-119 ~]# lvcreate  -V 1G -T snapper_thinp/POOL -n other6
  Using default stripesize 64.00 KiB.
  Cannot create new thin volume, free space in thin pool snapper_thinp/POOL reached threshold.
[root@host-119 ~]# lvcreate  -V 1G -T snapper_thinp/POOL -n other7
  Using default stripesize 64.00 KiB.
  Cannot create new thin volume, free space in thin pool snapper_thinp/POOL reached threshold.

[root@host-119 ~]# dmsetup status
snapper_thinp-origin: 0 4194304 thin 134400 4194303
snapper_thinp-POOL: 0 2097152 linear 
snapper_thinp-other5: 0 4194304 thin 128 127
snapper_thinp-other4: 0 4194304 thin 128 127
snapper_thinp-other3: 0 4194304 thin 128 127
snapper_thinp-POOL-tpool: 0 2097152 thin-pool 7 148/1024 16384/16384 - out_of_data_space no_discard_passdown error_if_no_space - 
snapper_thinp-POOL_tdata: 0 2097152 linear 
snapper_thinp-other2: 0 4194304 thin 128 127
snapper_thinp-full_snap: 0 4194304 thin 2096000 4194303
snapper_thinp-POOL_tmeta: 0 8192 linear 
snapper_thinp-other1: 0 4194304 thin 128 127
Comment 9 errata-xmlrpc 2016-11-04 04:21:54 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-2016-1445.html
Note You need to log in before you can comment on or make changes to this bug.