drbd version in pve 7

[jmckee]

Hello. I want to know if pve 7 contains drbd 8 or some other version? (or none)
Last year I upgraded my pve 5 to pve 6 using "in place" and my drbd was broken. I tried hard to fix it but had to give up.
So now I am getting back to this and am thinking I will reinstall pve from an iso. Might as well use pve 7, right?
BTW, drbd 9 never worked for me and I am not too sure what the latest is (Linstor?). I just want good old drbd 8 - it does the trick.
Please don't tell me to use other technology - I just have a small 3 node cluster and the replication is just between 2 of the nodes.
Any advice - should I downgrade to pve 5 or upgrade to 7? I just want the good old drbd.
Also, I don't think I need the "plugin" - I just use the command line.

 

[jmckee]

Maybe I should simplify my question? Proxmox is a custom kernel, right? I am just asking what version of drbd is in the latest pve? Is it still drbd 8 I hope?

 

[fabian]

$ modinfo drbd
filename:       /lib/modules/5.13.19-3-pve/kernel/drivers/block/drbd/drbd.ko
alias:          block-major-147-*
license:        GPL
version:        8.4.11
description:    drbd - Distributed Replicated Block Device v8.4.11
author:         Philipp Reisner <phil@linbit.com>, Lars Ellenberg <lars@linbit.com>
srcversion:     C83CE761848B9DE61379370
depends:        lru_cache,libcrc32c
retpoline:      Y
intree:         Y
name:           drbd
vermagic:       5.13.19-3-pve SMP mod_unload modversions
parm:           allow_oos:DONT USE! (bool)
parm:           disable_sendpage:bool
parm:           proc_details:int
parm:           minor_count:Approximate number of drbd devices (1-255) (uint)
parm:           usermode_helper:string

but we don't ship a storage plugin for DRBD (anymore), and AFAIK the third-party one by linbit is for DRBD9/linstore..

 

[jmckee]

by "plugin" you mean proxmox web gui functionality right?

 

[fabian]

both GUI integration and the whole volume management by PVE.

 

[jmckee]

But wait, according to the old guide I setup lvm on top of drbd so proxmox just sees lvm right?

 

[fabian]

I am not sure, but in any case, it's not something we support so you'd have to figure out any issues yourself (and I don't think upstream would be much helper either since you are not running their recommended version and tooling).

 

[jmckee]

it's not something we support

ok but you used to -> https://pve.proxmox.com/mediawiki/index.php?title=DRBD&oldid=9622

So, how about recreating the guide using the current favorite ceph? O can I get a link?

 

[fabian]

yes, but that approach had multiple downsides (see the parts about split brain recovery). for ceph you need at least three nodes (more is better) - but there is a whole chapter in the admin guide, and performance examples here on the forum:

https://pve.proxmox.com/pve-docs/pve-admin-guide.html#chapter_pveceph
https://forum.proxmox.com/threads/proxmox-ve-ceph-benchmark-2020-09-hyper-converged-with-nvme.76516/