[DRBD-user] DRBD/Linstor/Proxmox diskless storage-pools

[Gianni Milo]

I would test it first without proxmox gui. That is,  by creating a test
resource and volume definition via linstor command. Then after, I would
create a test resource based on the above and assign that resource to each
node.

If your configuration is correct, then the resource should become diskful
on one node and diskless on the rest. You can use drbdtop or drbdadm
command to verify the above.

Regarding why proxmox gui is not showing stuff correctly when you add the
entries in storage.cfg, it may be a syntax error somewhere in that file or
you may have to check syslog over cli to see why it doesn't like it.

G.


On Mon, 27 Jan 2020 at 06:47, Rob Tongue <phunyguy at neverserio.us> wrote:

> Greetings!
>
> I have been trying for some time to solve this, hopefully someone here
> can help.  I currently have a working three node proxmox/drbd/linstor
> cluster, but have an interesting use case in addition that I cannot seem
> to make work.
>
> One of the 3 nodes has a large amount of spinning disks that I would
> like to use throughout the cluster as well, but I have no way to
> replicate that storage to the other two.  So I want to use two of the
> three nodes as "diskless" clients, while only the one node provides
> actual storage.  I do not care about redundancy for this storage
> instance, I only want to be able to mount the storage from any node,
> mainly because the two without the storage are more powerful machines as
> far as CPU and memory are concerned, but do not have the ability to host
> the actual storage.  I understand it is not ideal, but in this home lab,
> it is all I have.
>
> I could use NFS for this, but would rather use drbd, as I am fairly
> certain it would perform better due to the nature of the raw storage,
> rather than qcow2 images.
>
> So here is what I have tried:
>
> I have created as a test, a small lvm thinpool as a storage-pool on node1
>
> # linstor storage-pool create lvmthin tank1 test test/pve
>
> Then I created on tank2/tank3 diskless storage-pools.
>
> # linstor storage-pool create diskless tank2 test
> # linstor storage-pool create diskless tank3 test
>
> This is the result:
>
> # linstor storage-pool list
> ┊ StoragePool ┊ Node  ┊ Driver   ┊ PoolName      ┊ FreeCapacity ┊
> TotalCapacity ┊ SupportsSnapshots ┊ State ┊
>
> ╞═══════════════════════════════════════════════════════════════════════════════════════════════════════════╡
>
> *snip*
>
>
> ┊ test        ┊ tank1 ┊ LVM_THIN ┊ test/pve      ┊ 4.98 GiB ┊      4.98
> GiB ┊ True              ┊ Ok    ┊
> ┊ test        ┊ tank2 ┊ DISKLESS ┊ ┊              ┊               ┊
> False             ┊ Ok    ┊
> ┊ test        ┊ tank3 ┊ DISKLESS ┊ ┊              ┊               ┊
> False             ┊ Ok    ┊
>
> ╰───────────────────────────────────────────────────────────────────────────────────────────────────────────╯
>
> I then created the resource group:
>
> # linstor resource-group create --storage-pool test --place-count 1
> --diskless-on-remaining test
>
> (For clarity, I am not sure what to put for --place-count, so I tried 3
> as well with the same result.  I also tried without
> --diskless-on-remaining... same.)
>
> Then I finally created the volume-group
>
> # linstor volume-group create test
>
> When adding this storage to proxmox's storage.cfg, I lose the web
> interface of proxmox, and refreshing the page only provides the
> Datacenter top level section in the left pane, with nothing underneath
> it.  No nodes or anything.  Removing the storage.cfg entries, makes it
> all come back.  Very strange, and want to verify I did everything
> correctly.
>
> drbd: test
>      content images,rootdir
>      controller 10.128.1.100
>      resourcegroup test
>      controllervm 100
>
> Any ideas? Thanks in advance.
>
> -phunyguy
>
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