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items: NFS mounts disappearing from OAS servers
items: Re: NFS mounts disappearing from OAS servers

NFS mounts disappearing from OAS servers
type: item
description: Hi all, I'd like to brainstorm the following issue for possible causes: The Oracle database servers and Oracle Application Server servers we use, use NFS quite extensively. The database servers especially make use of NFS for database backups. Periodically the NFS mounts disappear from the servers. When this occurs, a lot of things can be affected. Any ideas as to what could cause this? Could some type of time-out on a router or firewall be a cause?
creator: nfshelp
date: 2007-10-19T21:33:55-00:00

Re: NFS mounts disappearing from OAS servers
type: item
description: Here's some further information: What mount option was used? Mnt point options server exported filesystem common -ro,soft,intr,retrans=9,tcp celerra01_cge0:/Mid-Range_Export_DBA_Common Are you automounting? YES Are the mounts clustered? no What does “nfsstat –m” say? [root@hsg05lt /]# nfsstat -m nfsstat: invalid option -- m Client rpc stats: calls retrans authrefrsh 6119 0 0 Client nfs v3: null getattr setattr lookup access readlink 0 0% 1600 26% 299 4% 669 10% 347 5% 0 0% read write create mkdir symlink mknod 73 1% 2721 44% 21 0% 0 0% 0 0% 0 0% remove rmdir rename link readdir readdirplus 0 0% 0 0% 0 0% 0 0% 0 0% 32 0% fsstat fsinfo pathconf commit 104 1% 104 1% 0 0% 149 2% [root@rac02lt /]# nfsstat -m nfsstat: invalid option -- m Server rpc stats: calls badcalls badauth badclnt xdrcall 0 0 0 0 0 Client rpc stats: calls retrans authrefrsh 14108 0 0 Client nfs v3: null getattr setattr lookup access readlink 0 0% 1210 8% 592 4% 147 1% 525 3% 0 0% read write create mkdir symlink mknod 13 0% 11139 78% 47 0% 0 0% 0 0% 0 0% remove rmdir rename link readdir readdirplus 0 0% 0 0% 0 0% 0 0% 0 0% 60 0% fsstat fsinfo pathconf commit 203 1% 60 0% 0 0% 112 0% What OS is this being run on? Client side Hsg05lt - Red Hat Enterprise Linux AS release 3 (Taroon Update 7) Rac02lt - Red Hat Enterprise Linux AS release 4 (Nahant Update 3) What's the timeout? The default timeout is .7 sec. with the retrans set to 9 I believe that we will get 7 minor timeouts (at which point we are at 60 secs.), this will generate a major timeout. We will get a mount failure when we have hit 3 major timeouts.
creator: nfshelp
date: 2007-10-22T21:34:23-00:00