Help with DRBD

briansnyder00 · 08-31-2017, 01:14 PM

Hello All!

I am having a problem mounting existing data from a non-drbd to drbd environment.

I started with a iSCSI target server running linux. It was mounted and formatted by a windows server as an NTFS partition.

Then I tried to take the existing data, create a drbd replicated volume, and re-present it as an iSCSI volume to windows. The problem is, the volume shows in Windows as it should except it is unformatted. I would really hate to start over it was almost 30TB of data.

Original:
/dev/disk/by-id/something <> iscsi target
After:
/dev/disk/by-id/something <> /drbd0
/drbd0 <> /iscsi target

I did run:
drbdadm create-md r0
drbdadm up r0
drbdadm primary --force r0
on the original volume. Would this have destroyed my partition?

Thanks for any help you can provide!
Brian

Chuck56 · 09-01-2017, 10:24 AM

Quote:

Originally Posted by briansnyder00

I did run:
drbdadm create-md r0
drbdadm up r0
drbdadm primary --force r0
on the original volume. Would this have destroyed my partition?

I'm not sure. Depends on what you did afterward. Per the DRBD docs: http://docs.linbit.com/docs/users-gu...repare-storage

Quote:

It is not necessary for this storage area to be empty before you create a DRBD resource from it. In fact
it is a common use case to create a two-node cluster from a previously non-redundant single-server system
using DRBD (some caveats apply — please refer to DRBD meta data if you are planning to do this).

YMMV!