Writing snapshots to another volume

[pixel24]

Hi@all,

I have two RAID volumes (LSI controller) on my Proxmox 6.4-13.

VOL1: 4 x 2TB SSD / RAID5
VOL2: 4 x 4TB HDD / RAID 5

Proxmox is installed on VOL1. The largest part is integrated for local LVM. The virtual disks of the VMs are located here.

VOL2 is used as a backup. PVE saves the VMs as DUMP here at night. Is it possible to configure PVE so that it writes the snapshots of the VMs to VOL2?

with best
pixel24

 

[bbgeek17]

LVM snapshot is a CoW - copy-on-write. Meaning that first write that changes monitored block will:
read existing data in that block
write that block elsewhere
write new data

If you send your "saved" data to HDD while trying to write to SSD your write performance will be that of HDD.

This may give you some pointers regarding possibility of what you are trying to achieve:
https://stackoverflow.com/questions/28942795/lvm-create-snapshot-between-volume-groups

However, default Proxmox layout is not suitable for this. You would likely have to reconfire/repartition your install. Whether its worth the trouble is up to you.

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