Hide Forgot
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.
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
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.
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
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