[linux-lvm] Snapshot of RAID 6 Volume
Adam Puleo
adam.puleo at icloud.com
Sun Aug 11 18:24:14 UTC 2019
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 at 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 at icloud.com> 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 at 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 at 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 at 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
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