Extend snapshot partition

[svori]

Hi,

I am trying to figure out what to do with an R80.40 MDS (Take 196) that does not have enough space to create snapshot.

To be able to create a snapshot it needs 33GB but only 17GB is available for snapshots.

There are no other snapshots created.

This MDS runs in a vmware virtual machine.

I have plans to do release upgrade to R81.20 soon.

I calculated space according to sk80260 and yes 17GB is the result of that calculation, but i do not understand how i can extend space or make snapshot smaller.

One possibility i have thought of is to setup another VM with R81.20 with more space and then migrate, but inplace upgrade is of course easier.

MDS>show snapshots
Creation of an additional restore point will need 34.080G
Amount of space available for restore points is 17.19G

MDS>df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_splat-lv_current 100G 30G 71G 30% /
/dev/sda1 291M 27M 249M 10% /boot
tmpfs 16G 11M 16G 1% /dev/shm
/dev/mapper/vg_splat-lv_log 241G 129G 112G 54% /var/log

MDS> [Expert@MDS-01:0]# vgdisplay
--- Volume group ---
VG Name vg_splat
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 468.19 GiB
PE Size 32.00 MiB
Total PE 14982
Alloc PE / Size 10912 / 341.00 GiB
Free PE / Size 4070 / 127.19 GiB
VG UUID Vea1bw-5ByP-1IvL-adyz-2I37-47Vz-gWfz9X

[Expert@MDS:0]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_splat/lv_log
LV Name lv_log
VG Name vg_splat
LV UUID 93DMI2-eS3E-l703-zvi9-rQPi-nVxD-KRUvKZ
LV Write Access read/write
LV Creation host, time localhost.localdomain, 2020-01-01 10:10:44
LV Status available
# open 1
LV Size 241.00 GiB
Current LE 7712
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1

--- Logical volume ---
LV Path /dev/vg_splat/lv_current
LV Name lv_current
VG Name vg_splat
LV UUID aWl5uh-CsVE-HXaN-sXul-Ru1U-XLej-rbF701
LV Write Access read/write
LV Creation host, time MDS, 2021-01-01 14:43:11
LV Status available
# open 1
LV Size 100.00 GiB
Current LE 3200
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2

[Bob_Zimmerman]

Snapshots don't actually go into a partition. They go into a storage pool (which is the partition) into available space not allocated to any other volume. To make more space for snapshots, you have to make the other volumes consume less space. The challenge is only an older filesystem called ext3 supports shrinking the volume. What does the command 'mount' return? It probably needs to be in expert mode.

[the_rock]

https://support.checkpoint.com/results/sk/sk92261