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I want to reduce size of backups taken from proxmox, snaphots by zfs and dataset size of kvms. Because as time pass by, with disk read/write/deletes, disk size increases unnecessarily. So I need release free space. Were I able to explain ?

This is what I to learn. I tried zerofilling, defragmenting disk but they do not seem to help much. Only couple of GBs is reduced. So you suggest shrink the partition to used size and extend again? Do you think if clonning kvm from proxmox might help ?

I am not using raidz. This happens with read/writes/deletes on disk. If I move data to newly installed kvm, size drops to real usage.

[root@ns34 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vda 252:0 0 150G 0 disk ├─vda1 252:1 0 100M 0 part /boot ├─vda2 252:2 0 30G 0 part /var ├─vda3 252:3 0 20G 0 part /usr ├─vda4 252:4 0 1K 0 part ├─vda5 252:5 0 8G 0 part [SWAP] ├─vda6 252:6 0...

From kvm: [root@ns34 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/vda7 976M 674M 252M 73% / tmpfs 1.7G 28K 1.7G 1% /dev/shm /dev/vda1 93M 76M 13M 87% /boot /dev/vda8 88G 53G 34G 61% /home /dev/vda6 2.0G 124M 1.7G 7%...

No one ?

None of them: root@s1:~# zfs list -t snapshot no datasets available Am I missing someting? Could this be something to do inside KVM? Like defragmantation ?

I noted that older zfs dataset is more space it uses than it really does. More clearly, kvm disk has only 51.53 GB in use. When I move this dataset to new node, it moves 152 GB; root@s1:~# pve-zsync sync --source 118 --dest 1.2.3.4:D4 --verbose send from @rep_default_2019-12-08_20:59:49 to...

Ok D1 was represnting rpool/data. When I set D1 > rpool/data command run fine.

Ok on remote backup server, command is: /usr/sbin/pve-zsync sync --source 1.2.3.4:125 --dest D1 --name 125WEEKLY --maxsnap 10 --method ssh Error comes: COMMAND: ssh -o 'BatchMode=yes' root@1.2.3.4 -- zfs send -- P2/vm-125-disk-1@rep_125WEEKLY_2019-09-26_01:41:32 | zfs recv -F --...

Better than that, I am only allowing traffic only between nodes and from my pc. And my pc has dynamic ip so I update it with following bash to update ip in rules in case of ip change: updateip.sh # crontab -e : */5 * * * * sh /updateip.sh # /etc/init.d/cron restart...

Yes you are right. I am taking backup from a different datacenter / country. And initiate from remote backup server only. But good point to remind.

From time to time, I am getting, "cannot receive new filesystem stream: destination has snapshots" error with pve-zsync task. To fix it, I have to delete all snapshots. What could cause this?

I was able to create two task so : root@backup:~# /usr/sbin/pve-zsync sync --source 1.2.3.4:101 --dest D3 --name 101DAILY --maxsnap 10 --method ssh root@backup:~# /usr/sbin/pve-zsync sync --source 1.2.3.4:101 --dest D4 --name 101WEEKLY --maxsnap 10 --method ssh Then I was able to see...

As far as source will be same, do not I have any option for multiple task for different time internal like weekly and daily sync jobs ?

I think it is not with crons because one job which is daily will eares weekly one. So I meant to create two seperate sync jobs. But this time I will also (I think) need to create two dataset for each jobs.?

I want to take snapshos of zfs weekly and daily. So can I create two cron task like: /usr/sbin/pve-zsync sync --source 1.2.3.4:100 --dest D3 --name 101DAILY --maxsnap 10 --method ssh and /usr/sbin/pve-zsync sync --source 1.2.3.4:100 --dest D3 --name 101WEEK --maxsnap 10 --method ssh

root@hs1:~# zpool list NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT P1 476G 255G 221G - - 15% 53% 1.00x ONLINE - root@hs1:~# zfs list -o name,quota,refquota,reservation,refreservation,volsize,used,available,referenced...

/usr/sbin/pve-zsync sync --source xx.xx.xx.xx:119 --dest D3 --name 119 --maxsnap 10 --method ssh GET ERROR: cannot create snapshot 'P1/vm-119-disk-0@rep_119_2019-09-04_10:22:20': out of space But there are enough space to create snapshot. root@hs1:~# zfs get all P1 NAME PROPERTY...

Sometimes, I see high disk io in GUI. How can I see what really causing it in ssh ?