Hi,
I'm trying to build a HA nfs system based on drbd and apart from the nfs
export everything is working fine. The problem is that when I force a
failover things seem to work fine yet when I fail back to the original
system the clients freeze for a very long time.
/mnt/tmp is the mountpoint on the client and I'm using the following to
test access:
for i in `seq 1 2000`; do echo $i; ls /mnt/tmp; sleep 1; done
on a failover the output look like this:
...
47
testfile testfile2
48
testfile testfile2
49
testfile testfile2
50
testfile testfile2
51
testfile testfile2
52
ls: cannot open directory /mnt/tmp: Permission denied
53
ls: cannot open directory /mnt/tmp: Permission denied
54
<<< freeze of several minutes >>>
testfile testfile2
55
testfile testfile2
56
testfile testfile2
...
The first question I have is how can I prevent the "Permission denied"
errors? If these occur on e.g. a mountpoint for MySQL for example this will
no doubt lead to problems with the database and that means the storage
isn't really redundant.
The second question is how do I reduce the failover time? I tried adding
timeo=30 to the client mount options but that doesn't seem to help.
This is what my cib looks like:
node storage1.dev
node storage2.dev
primitive p_drbd_nfs ocf:linbit:drbd \
params drbd_resource="nfs" \
op monitor interval="15" role="Master" \
op monitor interval="30" role="Slave"
primitive p_exportfs_data ocf:heartbeat:exportfs \
params fsid="1" directory="/mnt/data/export" options="rw,no_root_squash"
clientspec="*" \
op monitor interval="30s"
primitive p_fs_data ocf:heartbeat:Filesystem \
params device="/dev/drbd/by-res/nfs" directory="/mnt/data"
fstype="ext3" \
op monitor interval="10s"
primitive p_ip_nfs ocf:heartbeat:IPaddr2 \
params ip="192.168.2.190" cidr_netmask="24" \
op monitor interval="30s"
group g_nfs p_fs_data p_exportfs_data p_ip_nfs
ms ms_drbd_nfs p_drbd_nfs \
meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1"
notify="true"
colocation c_nfs_on_drbd inf: g_nfs ms_drbd_nfs:Master
order o_drbd_before_nfs inf: ms_drbd_nfs:promote g_nfs:start
property $id="cib-bootstrap-options" \
dc-version="1.0.12-unknown" \
cluster-infrastructure="openais" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore"
rsc_defaults $id="rsc-options" \
resource-stickiness="200"
Regards,
Dennis
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