NFS - how to tell the mount options

[Rick Stevens]

Waldher, Travis R wrote:
>>-----Original Message-----
>>From: Rick Stevens [mailto:rstevens at vitalstream.com] 
>>Sent: Wednesday, March 31, 2004 10:38 AM
>>To: Getting started with Red Hat Linux
>>Subject: Re: NFS - how to tell the mount options
>>
>>
>>Waldher, Travis R wrote:
>>
>>>I forgot where it was...
>>> 
>>>Where is the file that tells me what a NFS mount used as far as 
>>>options
>>>goes?  nfsv2 vs v3, cache settings, etc.?
>>
>>"man nfs" will give you the available options.  As far as 
>>where you specify them at mount time, that's in /etc/fstab.
>>
>>
>>>If I don't manually set how I want it to mount, I don't know how to 
>>>tell
>>>how it did mount.
>>
>>"mount" alone should show you which non-default options were 
>>actually used.  Those not displayed use the defaults shown in 
>>"man nfs":
>>
>>	[root at smtp-01-001 bin]# mount -l -t nfs
>>	netapp2:/VIRTMAIL on /virtmail type nfs
>>		(rw,tcp,hard,noac,rsize=8192,wsize=8192,
>>		nfsvers=3,addr=10.24.1.4)
>>
>>The stuff not displayed use the defaults.  The corresponding 
>>line in /etc/fstab (wrapped for easier reading) is:
>>
>>	netapp2:/VIRTMAIL     /virtmail      nfs   \
>>		rw,tcp,hard,noac,rsize=8192,wsize=8192,nfsvers=3
>>
>>Ok?
> 
> 
> Well... Here's the riddle.
> 
> How can I tell which version of nfs is being used.  The default
> according to the nfs man page is version 2.  I didn't specifically say
> use nfsvers2 or 3, so it should have used 2.
> 
> Then why are my nfs v3 nfs counters going up when I transfer data?
> 
> Client nfs v3:
> null       getattr    setattr    lookup     access     readlink
> 0       0% 31227016  5% 15363112  2% 19036511  3% 387690989  0% 228600
> 0%
> read       write      create     mkdir      symlink    mknod
> 63      0% 76477074  6% 4455603  0% 102785  0% 1276273  0% 24      0%
> remove     rmdir      rename     link       readdir    readdirplus
> 4114960  0% 168678  0% 10      0% 727     0% 103584  0% 0       0%
> fsstat     fsinfo     pathconf   commit
> 1547    0% 1547    0% 0       0% 4621261  0%
> 
> I have about 200 file systems mounted right now, many must be nfsv2,
> because that's all the server supports, obviously others decided to
> mount up to nfsv3.  BUT, how can I tell.  None of the commands you gave
> me are telling me anything, and I never specified in the fstab file
> which version of nfs to use.

If "mount" does not explicitly tell you that it's mounted as "nfsvers=3"
then it's V2.  The stats show up in the V3 client data because your
_client_ is V3 (which is backwards-compatible with V2).  I know, it's
weird, but that's how it goes.
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- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-  Memory is the second thing to go, but I can't remember the first! -
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