[DRBD-user] Adding a third node into existing drbd cluster

yi zhang zhangby66666 at gmail.com
Tue Jun 9 04:12:01 CEST 2020

dear all,
I have a drbd cluster with two nodes: C21 and C22. Now I want to add a
third node C23 into existing drbd cluster.
Here's how I did it:

1. drbdadm down r0
2. drbdadm apply-al r0
3. drbdadm dump-md r0 > r0-md
4. edit the r0-md:

     4.1 increased the number "max-peers" from 1 to 2.
     4.2 add the bitmap at the end of the dump file

     bitmap[1] {
        # at 0kB
        4096 times 0x0000000000000000;

5. drbdmeta 0 v09 /dev/vg1/lv1 internal restore-md r0-md

6. The first time I success, but second time report an error

> md_offset 3221221376
> al_offset 3221188608
> bm_offset 3220992000
> Found ext3 filesystem
>      3145728 kB data area apparently used
>      3145500 kB left usable by current configuration
> Device size would be truncated, which
> would corrupt data and result in
> 'access beyond end of device' errors.
> You need to either
>    * use external meta data (recommended)
>    * shrink that filesystem first
>    * zero out the device (destroy the filesystem)
> Operation refused.
> 7. I extended /dev/vg1/lv1 from 1G to 2G. It is also reporting this error.
How can I do it?

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