Proxmox HA 3 node, lost of a disk

Audieux

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Feb 27, 2024
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Hi, it's just an interrogation but, if I have 3 node and add 1 disk to each node and make it in a HA configuration and one disk dies. Do I lose any data (exept the data between the last replication)? Or will I be able to replace the disk like nothing ever happen.
 
Hi, it's just an interrogation but, if I have 3 node and add 1 disk to each node and make it in a HA configuration and one disk dies. Do I lose any data (exept the data between the last replication)? Or will I be able to replace the disk like nothing ever happen.
HA needs shared storage. Using local disks will not work at all (nothing is replicated).
 
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If you use ZFS (all of my machines do this) you can replicate the virtual disks of a VM to the other two nodes. Replication can automatically run once a day down to once every minute. But not every second. So the "copy" is nearly identical, but not 100%.

In the case that one of these disks fail then all data on that specific disk is lost. But the other two have copies - dated from the the last replication. Now you replace physically the damaged disk (for which you have to follow some steps, just connecting power and SATA is not enough) .

Storage Replication: https://pve.proxmox.com/pve-docs/chapter-pvesr.html
Storage Types: https://pve.proxmox.com/pve-docs/chapter-pvesm.html#_storage_types

PS: personally I do establish local redundancy via ZFS by establishing mirrors. When one disk dies my VMs do not notice this ;-)
 
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  • Like
Reactions: Audieux
If you use ZFS (all of my machines do this) you can replicate the virtual disks of a VM to the other two nodes. Replication can automatically run once a day down to once every minute. But not every second. So the "copy" is nearly identical, but not 100%.

In the case that one of these disks fail then all data on that specific disk is lost. But the other two have copies - dated from the the last replication. Now you replace physically the damaged disk (for which you have to follow some steps, just connecting power and SATA is not enough) .

Storage Replication: https://pve.proxmox.com/pve-docs/chapter-pvesr.html
Storage Types: https://pve.proxmox.com/pve-docs/chapter-pvesm.html#_storage_types

PS: personally I do establish local redundancy via ZFS by establishing mirrors. When one disk dies my VMs do not notice this ;-)
Thank, I cant do mirror because they are mini pc and only support 1 disk (2 if you count the nvme boot drive) so for my use case it DOES replicate to a certain degree and I dont lose any data, kinda
 

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