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<p class="MsoNormal">We first went down this path back in July 2013 and now I’m back again for more. It’s a similar situation but now with new versions of everything. I’m using glusterfs 3.4.2 with Fedora 20.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have 2 nodes named fw1 and fw2. When I ifdown the NIC I’m using for Gluster on either node, that node cannot see its Gluster volume, but the other node can see it after a timeout. As soon as I ifup that NIC, everyone can see everything
again. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is this expected behavior? When that interconnect drops, I want both nodes to see their own local copy and then sync everything back up when the interconnect connects again.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here are details. Node fw1 has an XFS filesystem named gluster-fw1. Node fw2 has an XFS filesystem named gluster-fw2. Those are both gluster bricks and both nodes mount the bricks as /firewall-scripts. So anything one node does in
/firewall-scripts should also be on the other node within a few milliseconds. The test is to isolate the nodes from each other and see if they can still access their own local copy of /firewall-scripts. The easiest way to do this is to ifdown the interconnect
NIC. But this doesn’t work. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here is what happens when I ifdown the NIC on node fw1. Node fw2 can see /firewall-scripts but fw1 shows an error. When I ifdown on fw2, the behavior is identical, but swapping fw1 and fw2.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On fw1, after an ifdown I lose connection with my Gluster filesystem.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[root@stylmark-fw1 firewall-scripts]# ifdown enp5s4<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw1 firewall-scripts]# ls /firewall-scripts<o:p></o:p></p>
<p class="MsoNormal">ls: cannot access /firewall-scripts: Transport endpoint is not connected<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw1 firewall-scripts]# df -h<o:p></o:p></p>
<p class="MsoNormal">df: â/firewall-scriptsâ: Transport endpoint is not connected<o:p></o:p></p>
<p class="MsoNormal">Filesystem Size Used Avail Use% Mounted on<o:p></o:p></p>
<p class="MsoNormal">/dev/mapper/fedora-root 17G 2.2G 14G 14% /<o:p></o:p></p>
<p class="MsoNormal">devtmpfs 989M 0 989M 0% /dev<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 0 996M 0% /dev/shm<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 564K 996M 1% /run<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 0 996M 0% /sys/fs/cgroup<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 0 996M 0% /tmp<o:p></o:p></p>
<p class="MsoNormal">/dev/sda2 477M 87M 362M 20% /boot<o:p></o:p></p>
<p class="MsoNormal">/dev/sda1 200M 9.6M 191M 5% /boot/efi<o:p></o:p></p>
<p class="MsoNormal">/dev/mapper/fedora-gluster--fw1 9.8G 33M 9.8G 1% /gluster-fw1<o:p></o:p></p>
<p class="MsoNormal">10.10.10.2:/fwmaster 214G 75G 128G 37% /mnt/fwmaster<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw1 firewall-scripts]#<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But on fw2, I can still look at it:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[root@stylmark-fw2 ~]# ls /firewall-scripts<o:p></o:p></p>
<p class="MsoNormal">allow-all failover-monitor.sh rcfirewall.conf<o:p></o:p></p>
<p class="MsoNormal">allow-all-with-nat initial_rc.firewall start-failover-monitor.sh<o:p></o:p></p>
<p class="MsoNormal">etc rc.firewall var<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw2 ~]#<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw2 ~]#<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw2 ~]# df -h<o:p></o:p></p>
<p class="MsoNormal">Filesystem Size Used Avail Use% Mounted on<o:p></o:p></p>
<p class="MsoNormal">/dev/mapper/fedora-root 17G 2.3G 14G 14% /<o:p></o:p></p>
<p class="MsoNormal">devtmpfs 989M 0 989M 0% /dev<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 0 996M 0% /dev/shm<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 560K 996M 1% /run<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 0 996M 0% /sys/fs/cgroup<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 0 996M 0% /tmp<o:p></o:p></p>
<p class="MsoNormal">/dev/sda2 477M 87M 362M 20% /boot<o:p></o:p></p>
<p class="MsoNormal">/dev/sda1 200M 9.6M 191M 5% /boot/efi<o:p></o:p></p>
<p class="MsoNormal">/dev/mapper/fedora-gluster--fw2 9.8G 33M 9.8G 1% /gluster-fw2<o:p></o:p></p>
<p class="MsoNormal">192.168.253.2:/firewall-scripts 9.8G 33M 9.8G 1% /firewall-scripts<o:p></o:p></p>
<p class="MsoNormal">10.10.10.2:/fwmaster 214G 75G 128G 37% /mnt/fwmaster<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw2 ~]#<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And back to fw1 – after an ifup, I can see it again:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[root@stylmark-fw1 firewall-scripts]# ifup enp5s4<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw1 firewall-scripts]#<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw1 firewall-scripts]# ls /firewall-scripts<o:p></o:p></p>
<p class="MsoNormal">allow-all failover-monitor.sh rcfirewall.conf<o:p></o:p></p>
<p class="MsoNormal">allow-all-with-nat initial_rc.firewall start-failover-monitor.sh<o:p></o:p></p>
<p class="MsoNormal">etc rc.firewall var<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw1 firewall-scripts]# df -h<o:p></o:p></p>
<p class="MsoNormal">Filesystem Size Used Avail Use% Mounted on<o:p></o:p></p>
<p class="MsoNormal">/dev/mapper/fedora-root 17G 2.2G 14G 14% /<o:p></o:p></p>
<p class="MsoNormal">devtmpfs 989M 0 989M 0% /dev<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 0 996M 0% /dev/shm<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 564K 996M 1% /run<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 0 996M 0% /sys/fs/cgroup<o:p></o:p></p>
<p class="MsoNormal">tmpfs 996M 0 996M 0% /tmp<o:p></o:p></p>
<p class="MsoNormal">/dev/sda2 477M 87M 362M 20% /boot<o:p></o:p></p>
<p class="MsoNormal">/dev/sda1 200M 9.6M 191M 5% /boot/efi<o:p></o:p></p>
<p class="MsoNormal">/dev/mapper/fedora-gluster--fw1 9.8G 33M 9.8G 1% /gluster-fw1<o:p></o:p></p>
<p class="MsoNormal">192.168.253.1:/firewall-scripts 9.8G 33M 9.8G 1% /firewall-scripts<o:p></o:p></p>
<p class="MsoNormal">10.10.10.2:/fwmaster 214G 75G 128G 37% /mnt/fwmaster<o:p></o:p></p>
<p class="MsoNormal">[root@stylmark-fw1 firewall-scripts]#<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What can I do about this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Greg Scott<o:p></o:p></p>
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