Other You can format a zfs zvol to ufs but is it usefull ?

[Alain De Vos]

What could be the uses of formating a zfs zvol to ufs ?

 

[SirDice]

Because you don't need ZFS for a small VM for example? Linux VMs format the disk image with ext4 or xfs for example. For all intents and purposes it's a disk image, you can format it with anything you like or even use it as a raw disk device. Why do think it has to be ZFS?

 

[Alain De Vos]

Indeed. If you format it to xfs you can linux on it via bhvye. And mount it in user-space with fusefs-lkl.

 

[mer]

Basically I think it boils down to "why do you want to use a zvol".

 

[Alain De Vos]

Well, you can do more or less the same with a file-backed memory-device.

 

[SirDice]

Like I said, a zvol is a disk image. And you get the added befits of the underlying ZFS features (clone, snapshots, dedup, compression, data redundancy, etc).

 

[grahamperrin]

… to ufs …

Do you have, in mind, a UFS-specific use case?

 

[Alain De Vos]

Not one I can think of.
I will look if you can configure bhvye that such a device is "the harddisk" for a guest.