DRBD can't use /dev/md4 because it's in use. It has a mounted filesystem using the entire device.
You have your resource stack out of order. You would share the drbd device created from the md4 device. However, /dev/md4 already has a file system so you must shrink it or use external metadata. I'd suggest you shrink it and use internal metadata. What you have: * There are various disk devices (not specified) * Upon which is run raid providing /dev/md4 * Which contains an ext2 filesystem (/srv) * Which is shared. What you want: * There are various disk devices (not specified) * Upon which is run raid providing /dev/md4 * Which is the backing device for DRBD * Which provides /dev/drbd1 * Which contains an ext2 filesystem (/srv) * Which is shared. Clear as mud? Dan From: [email protected] [mailto:[email protected]] On Behalf Of Martin Krammer, New Media Interactive Sent: Monday, August 19, 2013 4:16 AM To: [email protected] Subject: [DRBD-user] DRDB over Software RAID1 - Failure: (104) Can not open backing device I have two webservers running debian 7 (stable) with software RAID1 and DRBD 8.3.11. On both servers there are the following shares, which should be connected: On stella: /dev/md4 919014380 204664 872126436 1% /srv On laura: /dev/md4 442143360 153168996 266514700 37% /srv Later, the data of laura should be syncronized on /dev/drdb1. The conf-file looks like: resource r1 { on stella { device /dev/drbd1; disk /dev/md4; address 192.168.1.1:7789; meta-disk /dev/sdb3[0]; } on laura { device /dev/drbd1; disk /dev/md4; address 192.168.1.2:7789; meta-disk /dev/sdb2[0]; } } If I try to attach... root@stella:/srv# drbdadm attach r1 --== Thank you for participating in the global usage survey ==-- The server's response is: node already registered 1: Failure: (104) Can not open backing device. Command 'drbdsetup 1 disk /dev/md4 /dev/sdb3 0 --set-defaults --create-device --on-io-error=detach' terminated with exit code 10 Could anybody help me please? Martin.
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