Hello, Is it possible to create a snapshot of a RAID 6 LVM? I have tried the following command: lvcreate --extents 50%FREE --snapshot --name lv_data_snapshot /dev/mapper/vg_data-lv_data I receive the same errors as noted below. How is it running out of space with the 50%FREE parameter? Thanks, -Adam [root@nas ~]# lvm version LVM version: 2.02.180(2)-RHEL7 (2018-07-20) Library version: 1.02.149-RHEL7 (2018-07-20) Driver version: 4.40.0 Configuration: ./configure --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-default-dm-run-dir=/run --with-default-run-dir=/run/lvm --with-default-pid-dir=/run --with-default-locking-dir=/run/lock/lvm --with-usrlibdir=/usr/lib64 --enable-lvm1_fallback --enable-fsadm --with-pool=internal --enable-write_install --with-user= --with-group= --with-device-uid=0 --with-device-gid=6 --with-device-mode=0660 --enable-pkgconfig --enable-applib --enable-cmdlib --enable-dmeventd --enable-blkid_wiping --enable-python2-bindings --with-cluster=internal --with-clvmd=corosync --enable-cmirrord --with-udevdir=/usr/lib/udev/rules.d --enable-udev_sync --with-thin=internal --enable-lvmetad --with-cache=internal --enable-lvmpolld --enable-lvmlockd-dlm --enable-lvmlockd-sanlock --enable-dmfilemapd On Jul 4, 2019, at 11:52 AM, Adam Puleo <adam.puleo@xxxxxxxxxx> wrote: Hello, I’m trying to create a LVM snapshot of a RAID 6 volume. From the error messages it appears that I do not have enough space in the volume group and / or on the physical volumes. How do I calculate the amount of space required? Thank you, -Adam [root@nas scripts]# lvcreate --size 1G --snapshot --name lv_data_snapshot /dev/vg_data/lv_data device-mapper: resume ioctl on (253:24) failed: Invalid argument Unable to resume vg_data-lv_data_snapshot (253:24). device-mapper: resume ioctl on (253:5) failed: Invalid argument Unable to resume vg_data-lv_data (253:5). Problem reactivating logical volume vg_data/lv_data. Aborting. Manual intervention required. Releasing activation in critical section. libdevmapper exiting with 1 device(s) still suspended. /var/log/messages: Jul 4 10:54:56 nas kernel: md/raid:mdX: not clean -- starting background reconstruction Jul 4 10:54:56 nas kernel: md/raid:mdX: device dm-10 operational as raid disk 0 Jul 4 10:54:56 nas kernel: md/raid:mdX: device dm-12 operational as raid disk 1 Jul 4 10:54:56 nas kernel: md/raid:mdX: device dm-16 operational as raid disk 2 Jul 4 10:54:56 nas kernel: md/raid:mdX: device dm-18 operational as raid disk 3 Jul 4 10:54:56 nas kernel: md/raid:mdX: device dm-22 operational as raid disk 4 Jul 4 10:54:56 nas kernel: md/raid:mdX: raid level 6 active with 5 out of 5 devices, algorithm 8 Jul 4 10:54:56 nas lvm[16521]: No longer monitoring RAID device vg_data-lv_data for events. Jul 4 10:54:57 nas kernel: device-mapper: table: 253:24: dm-20 too small for target: start=0, len=5788164096, dev_size=5788139520 Jul 4 10:54:57 nas kernel: device-mapper: table: 253:5: dm-20 too small for target: start=0, len=5788164096, dev_size=5788139520 Jul 4 10:54:57 nas kernel: md: resync of RAID array mdX Jul 4 10:54:57 nas kernel: md: mdX: resync done. [root@nas backups]# vgdisplay -v vg_data --- Volume group --- VG Name vg_data System ID Format lvm2 Metadata Areas 5 Metadata Sequence No 65 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 5 Act PV 5 VG Size <4.55 TiB PE Size 4.00 MiB Total PE 1192139 Alloc PE / Size 1177610 / 4.49 TiB Free PE / Size 14529 / 56.75 GiB VG UUID zvZJna-UMgX-oWOM-LLy8-En5o-q4sM-PpQA2Q --- Logical volume --- LV Path /dev/vg_data/lv_data LV Name lv_data VG Name vg_data LV UUID KjiDLl-Dk67-LarA-TU3W-UPEK-Z4kH-iKgQnj LV Write Access read/write LV Creation host, time nas.local, 2019-06-27 23:24:46 -0700 LV Status available # open 1 LV Size <2.70 TiB Current LE 706563 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 1280 Block device 253:5 --- Physical volumes --- PV Name /dev/sdc PV UUID AEYk3P-Ka2X-qCHh-dXPx-R0BZ-lKkI-SSNtIP PV Status allocatable Total PE / Free PE 238467 / 2945 PV Name /dev/sdb1 PV UUID sTU60I-uJdh-ylgC-Cf4l-JWte-34CN-jpGDq3 PV Status allocatable Total PE / Free PE 238418 / 2896 PV Name /dev/sda1 PV UUID a0Ick4-1nTm-VUJL-Vosl-OEbW-Btr8-I3pv2M PV Status allocatable Total PE / Free PE 238418 / 2896 PV Name /dev/sde1 PV UUID dgd702-ginH-5vAG-IPUJ-H0fm-6143-Jq8Nco PV Status allocatable Total PE / Free PE 238418 / 2896 PV Name /dev/sdd1 PV UUID gEpYRx-wJxa-VVMl-fNao-hsfF-QXKp-Z1dpBC PV Status allocatable Total PE / Free PE 238418 / 2896 [root@nas backups]# dmsetup status vg_data-lv_data_rimage_4: 0 1929388032 linear cl_nas-opt: 0 209715200 linear cl_nas-opt: 209715200 8192 linear vg_pc_backups-lv_pc_backups_rimage_1: 0 5583462400 linear vg_data-lv_data_rimage_3: 0 8192 linear vg_data-lv_data_rimage_3: 8192 1929379840 linear vg_pc_backups-lv_pc_backups_rimage_0: 0 5583462400 linear vg_data-lv_data_rimage_2: 0 8192 linear vg_data-lv_data_rimage_2: 8192 1929379840 linear vg_data-lv_data_rimage_1: 0 8192 linear vg_data-lv_data_rimage_1: 8192 1929379840 linear vg_backups-lv_backups: 0 9767911424 linear cl_nas-home: 0 154787840 linear vg_data-lv_data_rimage_0: 0 8192 linear vg_data-lv_data_rimage_0: 8192 1929379840 linear cl_nas-swap: 0 16515072 linear cl_nas-root: 0 104857600 linear vg_data-lv_data_rmeta_4: 0 8192 linear vg_data-lv_data_rmeta_3: 0 8192 linear vg_data-lv_data: 0 5788139520 raid raid6_zr 5 AAAAA 1929379840/1929379840 idle 0 8192 - vg_pc_backups-lv_pc_backups: 0 5583462400 raid raid1 2 AA 5583462400/5583462400 idle 0 0 - vg_data-lv_data_rmeta_2: 0 8192 linear vg_data-lv_data_rmeta_1: 0 8192 linear vg_slack-lv_slack: 0 3907403776 linear vg_pc_backups-lv_pc_backups_rmeta_1: 0 8192 linear vg_data-lv_data_rmeta_0: 0 8192 linear vg_pc_backups-lv_pc_backups_rmeta_0: 0 8192 linear _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
