[Drbd-dev] drbd: a proposal of two-primaries mode

[rui.xu]

Hi Joel,


In my use-case, two-primaries drbd devices are used as the back-end disks of iSCSI respectively,
then the two iSCSI disks form a multi-path disk.


For example, there are two nodes(node-1 and node-2), all of them are primary nodes, suppose there is a  drbd

device called drbd1. Then drbd1 on node-1 is used as a back-end disk of iSCSI target, the peer device on node-2

is used as a back-end disk of iSCSI target too. At last, we make these two iSCSI disks into a multi-path disk.



Since multi-path may submit writes to two primaries nodes concurrently, conflicting writes will happen and cause
the drbd become unavailable.

Best regards,
Xu








From: Joel Colledge <joel.colledge at linbit.com>
Date: 2022-05-10 19:24:29
To:  "rui.xu" <rui.xu at easystack.cn>
Cc:  Philipp Reisner <philipp.reisner at linbit.com>,drbd-dev at lists.linbit.com,dongsheng.yang at easystack.cn
Subject: Re: drbd: a proposal of two-primaries mode>Hi Xu,
>
>Could you describe your use case in more detail? What are you trying
>to achieve with DRBD?
>
>This will help understand why you would like to restore the
>functionality. Perhaps there is a simpler solution that also works for
>your purposes.
>
>Best regards,
>Joel




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