[DRBD-user] Create a third diskless node on an active 2-node cluster
Gábor Hernádi
gabor.hernadi at linbit.com
Wed Mar 3 12:48:32 CET 2021
Hello,
when you executed `linstor node create C ...` Linstor should have given you
a list of supported layers + providers or reasons why layers / providers
are not supported. You can recheck that list with
linstor node info
That command should tell you why Linstor thinks that C does not support
DRBD.
Best regards,
Gabor
On Wed, Mar 3, 2021 at 12:29 PM Ferran Alchimia <ferran.alchimia at gmail.com>
wrote:
> Hi,
>
> I currently have a 2 node (combined) cluster and I want to add an HA
> linstor-controller. I was following this guide
> https://www.linbit.com/drbd-user-guide/linstor-guide-1_0-en/#s-linstor_ha
>
> The first step asks for an AutoQuorum capable resource. So I think I have
> to add a third node to my cluster. This is my starting position:
>
> ╭─────────────────────────────────────────────────────╮
> ┊ Node ┊ NodeType ┊ Addresses ┊ State ┊
> ╞═════════════════════════════════════════════════════╡
> ┊ H ┊ COMBINED ┊ 10.0.7.106:3366 (PLAIN) ┊ Online ┊
> ┊ T ┊ COMBINED ┊ 10.0.7.105:3366 (PLAIN) ┊ Online ┊
> ╰─────────────────────────────────────────────────────╯
>
> ╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
> ┊ StoragePool ┊ Node ┊ Driver ┊ PoolName ┊
> FreeCapacity ┊ TotalCapacity ┊ CanSnapshots ┊ State ┊
>
> ╞══════════════════════════════════════════════════════════════════════════════════════════════════════════════════════╡
> ┊ DfltDisklessStorPool ┊ H ┊ DISKLESS ┊ ┊
> ┊ ┊ False ┊ Ok ┊
> ┊ DfltDisklessStorPool ┊ T ┊ DISKLESS ┊ ┊
> ┊ ┊ False ┊ Ok ┊
> ┊ drbdpool ┊ H ┊ LVM_THIN ┊ vgthc1/drbdpool ┊
> 3.13 TiB ┊ 3.49 TiB ┊ True ┊ Ok ┊
> ┊ drbdpool ┊ T ┊ LVM_THIN ┊ vgthc1/drbdpool ┊
> 3.13 TiB ┊ 3.49 TiB ┊ True ┊ Ok ┊
>
> ╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
>
> Since my third node won't have any storage devices dedicated to drbd I
> presumed that I could add a DISKLESS node (I don't know if this is true),
> just for quorum and not for replica.
>
> linstor n create --node-type satellite C 10.100.1.3
>
> linstor n l
> ╭───────────────────────────────────────────────────────────╮
> ┊ Node ┊ NodeType ┊ Addresses ┊ State ┊
> ╞═══════════════════════════════════════════════════════════╡
> ┊ C ┊ SATELLITE ┊ 10.100.1.3:3366 (PLAIN) ┊ Online ┊
> ┊ H ┊ COMBINED ┊ 10.0.7.106:3366 (PLAIN) ┊ Online ┊
> ┊ T ┊ COMBINED ┊ 10.0.7.105:3366 (PLAIN) ┊ Online ┊
> ╰───────────────────────────────────────────────────────────╯
> linstor sp create diskless C drbdpool
>
>
> ╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
> ┊ StoragePool ┊ Node ┊ Driver ┊ PoolName ┊
> FreeCapacity ┊ TotalCapacity ┊ CanSnapshots ┊ State ┊
>
> ╞══════════════════════════════════════════════════════════════════════════════════════════════════════════════════════╡
> ┊ DfltDisklessStorPool ┊ C ┊ DISKLESS ┊ ┊
> ┊ ┊ False ┊ Ok ┊
> ┊ DfltDisklessStorPool ┊ H ┊ DISKLESS ┊ ┊
> ┊ ┊ False ┊ Ok ┊
> ┊ DfltDisklessStorPool ┊ T ┊ DISKLESS ┊ ┊
> ┊ ┊ False ┊ Ok ┊
> ┊ drbdpool ┊ C ┊ DISKLESS ┊ ┊
> ┊ ┊ False ┊ Ok ┊
> ┊ drbdpool ┊ H ┊ LVM_THIN ┊ vgthc1/drbdpool ┊
> 3.13 TiB ┊ 3.49 TiB ┊ True ┊ Ok ┊
> ┊ drbdpool ┊ T ┊ LVM_THIN ┊ vgthc1/drbdpool ┊
> 3.13 TiB ┊ 3.49 TiB ┊ True ┊ Ok ┊
>
> ╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
>
> I add the --diskless-on-remaining flag for the rg definition (I don't know
> if this is needed)
> linstor rg m drbdpoolvm --place-count 2 --diskless-on-remaining
>
> linstor rg l
> ╭──────────────────────────────────────────────────────────────────╮
> ┊ ResourceGroup ┊ SelectFilter ┊ VlmNrs ┊ Description ┊
> ╞══════════════════════════════════════════════════════════════════╡
> ┊ DfltRscGrp ┊ PlaceCount: 2 ┊ ┊ ┊
> ╞┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄╡
> ┊ drbdpoolvm ┊ PlaceCount: 2 ┊ 0 ┊ ┊
> ┊ ┊ StoragePool(s): drbdpool ┊ ┊ ┊
> ┊ ┊ DisklessOnRemaining: True ┊ ┊ ┊
> ╰──────────────────────────────────────────────────────────────────╯
>
> And then I try to create a test resource
> linstor resource create T test
> SUCCESS:(...)
>
> linstor resource create H test
> WARNING: Could not find suitable node to automatically create a tie
> breaking resource for 'test'.
> SUCCESS:(...)
>
> linstor resource create C test
> ERROR:Description: Satellite 'C' does not support the following layers:
> [DRBD]Details: Node(s): 'C', Resource: 'test'Show reports: linstor
> error-reports show 603F507D-00000-000005
>
> As you can see the resource creation fails on C node. I have installed
> drbd on that node just in case, here goes the output:
> drbdadm --version
> DRBDADM_BUILDTAG=GIT-hash:\ a7820b3c14497a34f955ba5ce56cf1bc9d2d353e\
> build\ by\ @buildsystem\,\ 2021-02-09\ 09:27:27
> DRBDADM_API_VERSION=1
> DRBD_KERNEL_VERSION_CODE=0x08040b
> DRBDADM_VERSION_CODE=0x091000
> DRBDADM_VERSION=9.16.0
>
> Overall my C node does not have any "storage" for the drbd cluster, I just
> want it to be a diskless node in order to achieve HA for the resources. It
> seems I have misunderstood something but I just don't know where to look
> for more info. Any hints/help would be appreciated.
>
> Regards,
> Ferran
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--
Best regards,
Gabor Hernadi
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