LVM Snapshot script for shared storage LVM over iSCSI only

[rustine22]

Hello, when you unzip last version downloaded from here to a pve node : https://forum.proxmox.com/threads/l...torage-lvm-over-iscsi-only.150068/post-706396

with (as root on the pve node)

unzip pve_iscsi_lvm_snapshot.zip
chmod 700 pve_iscsi_lvm_snapshot.sh

./pve_iscsi_lvm_snapshot.sh should work

 

[rustine22]

warning in production environment, testing only !!

 

[rustine22]

Here the english version of script.

For testing purpose only !!!

 

[waltar]

Thanks for sharing as it may be useful for anybody (we don't use iscsi yet).

 

[rustine22]

No problem. But script is only for shared storage LVM over iSCSI

 

[david.eberle_sts]

@rustine22 a comment and a question for you.. first off thank you very much for an English version of the script, i say that as when i tried to use the original script that was created, i tried to do a translation of that script into English and for some reason when i did that it messed up something in the script so when i ran it it caused an error. when i ran the new version with the translation it worked like it was suppose too. that brings me to my question. where does this script "save" the snapshots? on the local machine or on the ISCSI share?

TIA

 

[rustine22]

Hi, the snapshot is stored on the iscsi share. In fact, this is the snapshot feature of lvm, and lvm is over iscsi.

 

[david.eberle_sts]

is there a place to view them in the GUI so that if i need to revert to that snapshot i can do so? or is this just for the command line?

 

[rustine22]

No sorry, it's just a proof of concept. I don't know pve enough to integrate this feature in gui.

 

[fabian]

this script is unfortunately rather dangerous, as it has no guards whatsoever against
- concurrent modifications of the VG on other cluster nodes
- concurrent actions on the VM itself (migration, backup, config changes)

both could lead to issues such as data loss, failed PVE tasks/actions and leftover volumes

 

[PwrBank]

this script is unfortunately rather dangerous, as it has no guards whatsoever against
- concurrent modifications of the VG on other cluster nodes
- concurrent actions on the VM itself (migration, backup, config changes)

both could lead to issues such as data loss, failed PVE tasks/actions and leftover volumes

Any plans on introducing a cluster aware iSCSI implementation?

 

[UdoB]

Any plans on introducing a cluster aware iSCSI implementation?

It is classified as "shared": https://pve.proxmox.com/pve-docs/chapter-pvesm.html#_storage_types

Unfortunately "shared" is not the only feature you want ;-)

 

[fabian]

you can already use iSCSI in different forms, but snapshots currently require a storage plugin that can talk to the iscsi box to do the snapshots there (like our own zfs-over-iscsi plugins, or some external ones).