On Mon, Dec 14, 2009 at 05:40:20PM +0530, Tharindu Rukshan Bamunuarachchi wrote:
> I can not set nfs4leasetime value less than 10 seconds.
>
> there is a verification in __write_leasetime(). (lease < 10 || lease > 3600)
>
> I am going to change this to ~2 second (to make NFS HA failover happen
> in less than 10 seconds with HeartBeat).
>
> Any reason why is this checked for 10 (i.e. lease < 10) ... ?
No reason for that particular limit, but this does mean every client
will have to send a small NFSv4 operation to the server at least once
every 2 seconds as long as it holds any opens or other state. And if the
network goes down for more than 2 seonds the client will probably lose
that state.
Is it the grace-period time on the takeover server that you're trying to
limit?
--b.
>
>
>
>
>
> static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
> {
> /* if size > 10 seconds, call
> * nfs4_reset_lease() then write out the new lease (seconds) as reply
> */
> char *mesg = buf;
> int rv, lease;
>
> if (size > 0) {
> if (nfsd_serv)
> return -EBUSY;
> rv = get_int(&mesg, &lease);
> if (rv)
> return rv;
> if (lease < 10 || lease > 3600)
> return -EINVAL;
> nfs4_reset_lease(lease);
> }
>
> return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
> nfs4_lease_time());
> }
>
> --
> Tharindu Rukshan Bamunuarachchi
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