[PVE-User] How to use lvm on zfs ?

Denis Morejon denis.morejon at etecsa.cu
Wed Aug 8 15:32:48 CEST 2018


Why does Proxmox team have not incorporated a software Raid in the 
install process ? So that we could include redundancy and lvm advantages 
when using local disks.




El 08/08/18 a las 09:23, Denis Morejon escribió:
>
>
> El 07/08/18 a las 17:51, Yannis Milios escribió:
>>>   (zfs create -V 100G rpool/lvm) and make that a PV (pvcreate
>>>>> /dev/zvol/rpool/lvm) and make a VG (vgcreate pve /dev/zvol/rpool/lvm)
>>>>> and then a LV (lvcreate -L100% pve/data)
>>>>
>> Try the above as it was suggested to you ...
>>
>>
>>>> But I suspect I have no space to create an
>>>>> additional zfs volume since the one mounted on "/" occupied all 
>>>>> the space
>>>
>> No, that's a wrong assumption, zfs does not pre-allocate the whole 
>> space of
>> the pool, even if looks like it does so. In short there is no need to
>> "shrink" the pool in order to create a zvol as it was suggested above...
>> Still, the whole idea of having LVM ontop of ZFS/zvol is a mess, but 
>> if you
>> insist, it's up to you ...
>> A combination of Linux RAID + LVM would look much more elegant in your
>> case, but for that you have to reinstall PVE by using the Debian iso.
>> During the installation create a linux raid array with lvm on top and 
>> then
>> add PVE repos ass described in the wiki:
>>
>> https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_Jessie
> That's right. Now I understand that lvm/zfs would be a mess. Mainly 
> because
> zfs doesn't create a block devices such as partitions on which I could 
> do pvcreate ...
> and make It part of a lvm volumen group.
>
> After a (zfs create -V 100G rpool/lvm) a have to do a losetup to 
> create a loop device an so on...
>
> Instead, I will keep zfs Raid mounted on "/" (local storage) on the 
> last 4 Proxmox, remove the local-lvm storage from all Proxmox, and 
> resize the local storage of the first 4 Proxmox . In such a way that 
> all the 8 Proxmox have just local storage making the migration of VMs 
> between nodes easy.
>
>
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>



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