/var/lib/nfs/v4recovery

/var/lib/nfs/v4recovery

[mehta kiran]

Hi,
   I could see that it is mentioned that
   /var/lib/nfs/v4recovery needs to be created
   for NFSv4 at=20
=20
http://www.citi.umich.edu/projects/nfsv4/linux/using-nfsv4.html.
   1. What is this file for ?
      As NFSv4 uses lease based locking , it does
      create files on persistent storage.
      And its state could be stored  =20
      in /var/lib/nfs/statd/state , right ?

   2. I have read that lease time for NFSV4 can be=20
      chnaged by setting value in
      /proc/fs/nfsd/nfsv4leasetime. In case i dont
      set lease period  , is grace period set by user
      considered as the lease time ?

Thanks,
 kiran
    =20

    =20

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Re: /var/lib/nfs/v4recovery

[mehta kiran]

Hi,
   I could see that it is mentioned that
   /var/lib/nfs/v4recovery needs to be created
   for NFSv4 at=20
=20
http://www.citi.umich.edu/projects/nfsv4/linux/using-nfsv4.html.
   1. What is this file for ?
      As NFSv4 uses lease based locking , it does
"NOT"
      create files on persistent storage.
      And its state could be stored  =20
      in /var/lib/nfs/statd/state , right ?

   2. I have read that lease time for NFSV4 can be=20
      chnaged by setting value in
      /proc/fs/nfsd/nfsv4leasetime. In case i dont
      set lease period  , is grace period set by user
      considered as the lease time ?

Thanks,
 kiran








--- mehta kiran <kiranmehta1981@yahoo.com> wrote:

> Hi,
>    I could see that it is mentioned that
>    /var/lib/nfs/v4recovery needs to be created
>    for NFSv4 at=20
> =20
>
http://www.citi.umich.edu/projects/nfsv4/linux/using-nfsv4.html.
>    1. What is this file for ?
>       As NFSv4 uses lease based locking , it does
>       create files on persistent storage.
>       And its state could be stored  =20
>       in /var/lib/nfs/statd/state , right ?
>=20
>    2. I have read that lease time for NFSV4 can be=20
>       chnaged by setting value in
>       /proc/fs/nfsd/nfsv4leasetime. In case i dont
>       set lease period  , is grace period set by
> user
>       considered as the lease time ?
>=20
> Thanks,
>  kiran
>     =20
>=20
>     =20
>=20
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam
> protection around=20
> http://mail.yahoo.com=20
>=20
>=20
>
-------------------------------------------------------
> This SF.Net email is sponsored by xPML, a
> groundbreaking scripting language
> that extends applications into web and mobile media.
> Attend the live webcast
> and join the prime developer group breaking into
> this new coding territory!
>
http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D110944&bid=3D241720&dat=3D=
121642
> _______________________________________________
> NFS maillist  -  NFS@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nfs
>=20


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that extends applications into web and mobile media. Attend the live webc=
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and join the prime developer group breaking into this new coding territor=
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Re: /var/lib/nfs/v4recovery

[J. Bruce Fields]

On Thu, Mar 09, 2006 at 11:44:11PM -0800, mehta kiran wrote:
> Hi,
>    I could see that it is mentioned that
>    /var/lib/nfs/v4recovery needs to be created
>    for NFSv4 at 
>  
> http://www.citi.umich.edu/projects/nfsv4/linux/using-nfsv4.html.
>    1. What is this file for ?
>       As NFSv4 uses lease based locking , it does
> "NOT"
>       create files on persistent storage.

It does need some persistent storage--see rfc3530 section 8.6.3.

--b.


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Re: /var/lib/nfs/v4recovery

[J. Bruce Fields]

On Thu, Mar 09, 2006 at 11:18:03PM -0800, mehta kiran wrote:
>    I could see that it is mentioned that
>    /var/lib/nfs/v4recovery needs to be created
>    for NFSv4 at 
>  
> http://www.citi.umich.edu/projects/nfsv4/linux/using-nfsv4.html.

We've had some negative feedback on the way we're storing persistant
state for reboot recovery.  Among other problems:
	- There's an objection (which I don't entirely claim to
	  understand) against nfsd doing directory operations in the
	  kernel
	- It doesn't give any chance for synchronous callouts for, e.g.,
	  mirroring the data to a backup server for failover, whereas
	  the standard statd stuff does.

Hopefully this will fixed by 2.6.17 or 2.6.18.

>    1. What is this file for ?
>       As NFSv4 uses lease based locking , it does
>       create files on persistent storage.
>       And its state could be stored   
>       in /var/lib/nfs/statd/state , right ?

I don't think we can store the state in exactly the same place, but we
probably will move to something more similar to statd.

>    2. I have read that lease time for NFSV4 can be 
>       chnaged by setting value in
>       /proc/fs/nfsd/nfsv4leasetime. In case i dont
>       set lease period  , is grace period set by user
>       considered as the lease time ?

Since we use leases to implement delegations, there's an ugly conflict
between /proc/sys/fs/lease-break-time and /proc/fs/nfsd/nfsv4leasetime,
which we're currently working on fixing.

--b.


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