<div dir="auto">You are not doing anything wrong... You have created a cluster where one node is primary, so you can read your files from that node. It looks like you want to create a dual primary solution. This is also possible with DRBD. It involves using different filesystems. It's been a few years since I've experimented with dual primary setups. I was not very impressed with the performance and trade-offs back than, but that might have improved.<div dir="auto"><br></div><div dir="auto">Cheers,</div><div dir="auto"><br></div><div dir="auto">Dirk</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 20, 2019, 16:20 JCA <<a href="mailto:1.41421@gmail.com">1.41421@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div>I am a complete newbie to this, so please bear with me.</div><div><br></div><div dir="ltr">I am trying to use DRBD in conjunction with Pacemaker. To this effect, I have followed the steps specified in chapter 7 of the Pacemaker's "Clusters from Scratch" document (see <a href="https://clusterlabs.org/pacemaker/doc/en-US/Pacemaker/2.0/pdf/Clusters_from_Scratch/Pacemaker-2.0-Clusters_from_Scratch-en-US.pdf" target="_blank" rel="noreferrer">here</a>) with a few variations - e.g. instead of using a logical volume, I use an actual partition (/dev/sdb1) which I formatted with ext4, rather than xfs.<div><br></div><div>In the terminology of the document above, when I am done with all the steps I end up with a /dev/drbd1 device in each of pcmk-1 and pcmk-2. The step in section 7.7 I executed (in pcmk-1) as follows:</div><div><br></div><div> # pcs -f fs_cfg resource create TestFS Filesystem device="/dev/drbd1" directory="/tmp/Testing" </div><div> fstype="ext4"</div><div><br></div><div>Before doing this, I created /tmp/Testing on both pcmk-1 and pcmk-2.</div><div><br></div><div>After everything is completed, in pcmk-2 I end up with /tmp/Testing containing the files that I earlier on copied into the directory to be shared in pcmk-1, as described in section 7.5. My problem is, how (and where) do I access those files in pcmk-1? At this point, they don't seem to be accessible, for I unmounted /dev/drbd1 in pcmk-1, as instructed at the end of section 7.5. I was hoping to be able to mount it again, in pcmk-1, but that is not working for me:</div><div><br></div><div><div> # mount /dev/drbd1 /mnt</div><div> mount: /dev/drbd1 is write-protected, mounting read-only</div><div> mount: mount /dev/drbd1 on /mnt failed: Wrong medium type</div></div><div><br></div><div>What am I doing wrong?</div><div><br></div></div></div></div>
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