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Operating Systems Linux Red Hat Memory problems in NFS client server Post 302633649 by blast on Wednesday 2nd of May 2012 09:54:36 AM
Old 05-02-2012
Memory problems in NFS client server

Hi all,

i have some doubts in a situation that i fail to get an answer in Google.

I have a solaris 10 nfs server and 5 centos 6.0 nfs clients.

The problem/situation is that in the clients the free memory is "disappearing" along the time (passing to used)..and it gets free if i umount the nfs mount point. I can see also that the speed that the memory is "disappearing" is related to the use of the nfs fs (3 of the 5 servers use the nfs fs more intensively and in those it disappears faster).

I m mounting with:
rw,vers=4,hard,rsize=32768,wsize=32768,noac

Kernel version:2.6.32-71.el6.x86_64 and 2.6.32-220.13.1.el6.x86_64 (i have updated in one server to check the behavior and its the same)

and:

rpm -aq | grep -i nfs
nfs-utils-1.2.2-7.el6.x86_64
nfs4-acl-tools-0.3.3-5.el6.x86_64
nfs-utils-lib-1.1.5-1.el6.x86_64

and in the updated server
nfs4-acl-tools-0.3.3-5.el6.x86_64
nfs-utils-lib-1.1.5-4.el6.x86_64
nfs-utils-1.2.3-15.el6.x86_64

By the way i m checking the memory with the free -m command in this line:
...
-/+ buffers/cache: 480 3286
...
(i did a umount/mount some time ago so now its not bad, but in couple of days it gets the opposite or worse..)


Can someone give me some lights about this behavior?

Thanks
 

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mountd(1M)																mountd(1M)

NAME
mountd - server for NFS mount requests and NFS access checks SYNOPSIS
/usr/lib/nfs/mountd [-v] [-r] mountd is an RPC server that answers requests for NFS access information and file system mount requests. It reads the file /etc/dfs/sharetab to determine which file systems are available for mounting by which remote machines. See sharetab(4). nfsd running on the local server will contact mountd the first time an NFS client tries to access the file system to determine whether the client should get read-write, read-only, or no access. This access can be dependent on the security mode used in the remoted procedure call from the client. See share_nfs(1M). The command also provides information as to what file systems are mounted by which clients. This information can be printed using the show- mount(1M) command. The mountd daemon is automatically invoked by share(1M). Only super user can run the mountd daemon. The options shown below are supported for NVSv2/v3 clients. They are not supported for Solaris NFSv4 clients. -r Reject mount requests from clients. Clients that have file systems mounted will not be affected. -v Run the command in verbose mode. Each time mountd determines what access a client should get, it will log the result to the con- sole, as well as how it got that result. /etc/dfs/sharetab shared file system table See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnfssu | +-----------------------------+-----------------------------+ nfsd(1M), share(1M), share_nfs(1M), showmount(1M), nfs(4), sharetab(4), attributes(5) Since mountd must be running for nfsd to function properly, mountd is automatically started by the svc:/network/nfs/server service. See nfs(4). Some routines that compare hostnames use case-sensitive string comparisons; some do not. If an incoming request fails, verify that the case of the hostname in the file to be parsed matches the case of the hostname called for, and attempt the request again. 27 Apr 2005 mountd(1M)
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