SOLVED Is the data in my VM safe?

[Davvo]

Show : TrueNAS-13.0-U2

MOBO: Supermicro X11SSL-F
CPU: Intel Pentium G4560
RAM: 1x16GB DDR4 2666MHz Unbuffered ECC
PSU: LC-Power 560W GOLD
BOOT: 1x Seagate IronWolf 250GB SATA SSD (ZA250NM1A002)
STORAGE: 2x Seagate IronWolf 3 TB CMR HDD (ST3000VN007)

I use FoundryVTT to play DnD online, and I used to manually launch it from my personal machine whenever we needed it online; since I got my TrueNas machine online 24/7 for backup (I found the ZFS searching for a solution to bitrotting) I decided to move into it, and after a bit of reasearch I opted for installing an Ubuntu VM just for that task (I am not familiar with dockers).

I am using my HDDs in a mirror, which also contains the backup dataset, as the zvol for it, and I have setup a snapshot task.

To my understanding this should be enough to assure the safety of the data of the FoundryVTT app that acts as server, but I read that usually for VMs you want to have syncwrites=on and a SLOG or at the very least an UPS. I have none of this, should I be concerned?​

 

[Patrick M. Hausen]

Can your application survive running on a "real" PC and having the power pulled at some random time? Sure there will be some transactions lost, but if DnD can survive that, you are fine in a VM, too. Snapshots are cheap, perform them hourly. Use a replication task to keep a daily snapshot on a different pool if possible.

The sync=always plus SLOG recommendation comes from the scenario of using TrueNAS as a storage device for e.g. VMware. In that case you have to ensure that when VMware thinks something is flushed to stable storage, it really is.

 

[Davvo]

Yeah, it can survive something like that. My fear was the corruption of the VM or something similar, thank you for your answer.