[PVE-User] New Proxmox cluster

Edgardo Ghibaudo edgardo.ghibaudo at provincia.biella.it
Mon Jun 6 11:32:26 CEST 2016

Il 06/06/2016 11:00, Lutz Willek ha scritto:
> Hey Edgardo, Dmitry,
> Am 06.06.2016 um 09:40 schrieb Edgardo Ghibaudo:
>> Il 03/06/2016 17:05, Dmitry Petuhov ha scritto:
>>> 03.06.2016 17:19, Lutz Willek wrote:
>>>> Maybe I dont understand you correctly, but qcow2 is not possible with
>>>> SAN.
>>>> http://pve.proxmox.com/wiki/Storage_Model
>>> Not quite. There's some cluster-aware filesystems like gfs2 or ocfs2,
>>> which can run over shared storage, including SAN, supporting not-raw
>>> images.
>>> I didn't seen official manuals for such setups, but googling for
>>> "proxmox iscsi gfs2" may give some hints.
> Well, of course there are options, finally we use Linux, so you can 
> almost do anything.
> However, I doubt that Edgardo would be happy with such kind of setup, 
> otherwise he would ask his questions in a different way. (no offence)
> Relative to the original post: I wonder if it is possible simply to 
> use NFS instead of iSCSI? This would be easy-peasy to implement, has 
> cluster capability (in proxmox terms) and qcow2 (i.e snapshots are 
> possible) could be used in addition to raw image-files.
>>> Storing images on local (or any other not shared) storage will break
>>> live-migration and HA, so it's better to store all VM images on shared
>>> storage, if you can.
> +1
>> I always created VMs using QEMU image format (qcow2) and I converted
>> some VMs from VMware using "qemu-image convert" selecting always qcow2.
>> If I correctly understood, before to migrate the VMs to the new SAN
>> iSCSI environment, I need to convert all the VMs from qcow2 to Raw disk
>> image and also for the VMware VMs vmdk I need to use "qemu-image
>> convert" selecting always Raw disk image.
> Yes. https://pve.proxmox.com/wiki/Migration_of_servers_to_Proxmox_VE
>> Following the document http://pve.proxmox.com/wiki/Storage_Model, in the
>> _LVM Groups with Network Backing section_:
>> after the definition of the Volume Group Name on the LUN, Proxmox see in
>> the Storage of the Datacenter the Volume Group.
>> How can create different Logical Volumes using EXT3 or EXT4 file systems
>> in the Proxmox Volume Group ?
> You may be able to do this, but doing so is useless, because ext3/4 is 
> not cluster-aware. (i.e. can not be used in a "clustered proxmox 
> setup" on different nodes at the same time)
>> In the Storage type Content section is reported the following:
>> SCSI <http://pve.proxmox.com/wiki/Special:Search?search=iscsi&go=Go>:
>> this storage is either used directly (Note: this can be dangerous, see
>> further down), or as a base to define local LVM storage entries (see
>> further down), or as ZFS, it needs a portal address and a target ID
>> What does it means ? Only ZFS over iSCSI ...
> So far I have almost no experience with ZFS, sorry.
>> Thanks, Edgardo
> Freundliche Grüße / Best Regards
>          Lutz Willek
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Following your experience, what kind of file system do you suggest for 
the iSCSI LUN of my cluster ?
When I prepare the node of the cluster installing Debian Jessie, what 
kind of file system do you suggest for each node ?

Thanks, Edgardo

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