[Pacemaker] how does the exportfs resource agent work?
emmanuel segura
emi2fast at gmail.com
Mon Jan 16 07:06:54 EST 2012
you should check how you mount the nfs cluster share from your client
for example
mount -o hard,rw,rsize=32768,wsize=32768,suid,proto=tcp,vers=3 -t nfs
your_virtual_ip:/your_cluster_fs_share /mountpoint
man nfs
=====================================================
timeo=n The value in tenths of a second before sending the
first retransmission after an RPC timeout. The
default value is 7 tenths of a second. After the
first timeout, the timeout is doubled after each suc-
cessive timeout until a maximum timeout of 60
seconds is reached or the enough retransmissions have
occured to cause a major timeout. Then, if the
filesystem is hard mounted, each new timeout cascade
restarts at twice the initial value of the
previous cascade, again doubling at each retransmission.
The maximum timeout is always 60 seconds. Better
overall performance may be achieved by increasing the
timeout when mounting on a busy network, to a slow
server, or through several routers or gateways.
retrans=n The number of minor timeouts and retransmissions
that must occur before a major timeout occurs. The
default is 3 timeouts. When a major timeout occurs,
the file operation is either aborted or a "server
not responding" message is printed on the console.
=======================================================
2012/1/16 Dennis Jacobfeuerborn <dennisml at conversis.de>
> What am I supposed to look for?
>
> Regards,
> Dennis
>
>
> On 01/16/2012 12:13 PM, emmanuel segura wrote:
>
>> I think man nfs it's can help you
>>
>> Try to look your nfs client options
>>
>> 2012/1/15 Dennis Jacobfeuerborn <dennisml at conversis.de
>> <mailto:dennisml at conversis.de>**>
>>
>>
>> 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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>>
>>
>>
>> --
>> esta es mi vida e me la vivo hasta que dios quiera
>>
>>
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>
>
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