[DRBD-user] Adding a Physical Disk to a Storage Pool

[Eric Robinson]

> -----Original Message-----
> From: drbd-user-bounces at lists.linbit.com <drbd-user-
> bounces at lists.linbit.com> On Behalf Of Roland Kammerer
> Sent: Thursday, April 28, 2022 9:47 AM
> To: drbd-user at lists.linbit.com
> Subject: Re: [DRBD-user] Adding a Physical Disk to a Storage Pool
>
> On Thu, Apr 28, 2022 at 02:41:53PM +0000, Eric Robinson wrote:
> > There are about 200 resources between the two nodes.  'systemctl
> > restart linstor-satellite' does not touch the running resources or
> > disrupt service, right?
>
> There are no interruptions. That is the lovely part when control and data
> plane are separated.
>

Turns out there was no need. I added a small resource as a test and the storage pool numbers now show correctly. You were right, thanks!

This does raise a related question, though. I only recently read the part of the Linstor User Guide where it talks about confining failure domains by creating one storage pool for each backend device (section 1.10.1). I wish I had known that sooner. When we created our volume groups, we did it like this...

# vgcreate  vg0 /dev/nvme0n1 /dev/nvme1n1 /dev/nvme2n1 /dev/nvme3n1 /dev/nvme4n1 /dev/nvme5n1

It's all one big volume group and we let Linstor provision resources wherever it wants. What is the effect If one NVME drive fails? Do all resources on the node go diskless, or just resources that happen to live entirely on the failed drive?

> Regards, rck
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