[DRBD-user] Switch from MD to DRBD

pierpaolo.fasano pierpaolo.fasano at coritel.it
Fri Mar 16 15:34:46 CET 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Hi all,
thank you. It has seemed to me that the solution is to clear the bitmap and let DRBD consider data consistent on both disks.
Indeed I followed the steps showed in http://www.drbd.org/users-guide-8.3/re-drbdsetup.html and it works fine!

After I've disabled MD raid and configured DRBD resource based on the former raid disks I started drbd in this way:

1.On both nodes, initialize meta data and configure the device.
drbdadm -- --force create-md res

2.They need to do the initial handshake, so they know their sizes.
drbdadm up res

3.They are now Connected Secondary/Secondary Inconsistent/Inconsistent. Generate a new current-uuid and clear the dirty bitmap.
drbdadm -- --clear-bitmap new-current-uuid res

4.They are now Connected Secondary/Secondary UpToDate/UpToDate. Make one side primary and create a file system.
drbdadm primary res

Hoping this can help somebody else,



Da:			 "Florian Haas" florian at hastexo.com
A:	         "pierpaolo.fasano" pierpaolo.fasano at coritel.it
Cc:           drbd-user at lists.linbit.com
Data Fri, 16 Mar 2012 14:27:00 +0100
Oggetto: Re: [DRBD-user] Switch from MD to DRBD

> On Fri, Mar 16, 2012 at 1:32 PM, pierpaolo.fasano
> <pierpaolo.fasano at coritel.it> wrote:
> > Hi,
> > I'm in the middle of switching from a software RAID1 based on MD to another one based on DRBD but using the same disks.
> > I've verified that no data loss occurs during this operation, but I'm wondering if it's possible to avoid the initial full synchronization between disks since I'm sure the two disks are already mirrored by MD.
> > Is it possible to achieve it and in which way?
> http://www.drbd.org/users-guide-8.3/s-using-truck-based-replication.html
> Cheers,
> Florian
> -- 
> Need help with High Availability?
> http://www.hastexo.com/now

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