[Linux-cluster] lock_dlm to lock_nolock
Steven Whitehouse
swhiteho at redhat.com
Wed Jul 9 08:50:31 UTC 2008
Hi,
On Tue, 2008-07-08 at 13:20 -0400, Ozgur Akan wrote:
> Hi,
>
> Can I mount a gfs filesystem formatted with lock_dlmlock and use it
> without a problem in the cluster if I have proper fencing and that fs
> is mounted to only one node at a time?
>
Single node DLM is quite possible, and I use it for testing from time to
time. Below though you appear to be using lock_nolock which is also ok
provided you only use it on one node at a time,
Steve.
> mount -o
> lockproto=lock_nolock /dev/mapper/cluster_vg-test2_lv /gfstwo/
>
>
> [root at rhtest01 ~]# ./ping -rw /gfstwo/test 1
> data increment = 1
> 140012 locks/sec
> [root at rhtest01 ~]# gfs2_tool df /gfstwo/
> /gfstwo:
> SB lock proto = "lock_dlm"
> SB lock table = "testcluster:gfstwo"
> SB ondisk format = 1801
> SB multihost format = 1900
> Block size = 4096
> Journals = 3
> Resource Groups = 60
> Mounted lock proto = "lock_nolock"
> Mounted lock table = "testcluster:gfstwo"
> Mounted host data = ""
> Journal number = 0
> Lock module flags = 1
> Local flocks = TRUE
>
>
> thanks,
> Ozgur Akan
> --
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