replicas and client support

replicas and client support

[Stijn De Weirdt]

hi all,

(pls keep me in cc, i'm not subscribed to this list)

i am trying out the replicas feature of exportfs, but i'm unable to get 
it working.

i would like to know if what i'm trying to is actually implemented in 
linux (or intended behaviour of replicas in the first place).

2 nfs4 servers with cluster filesystem (gpfs in my case). the os is 
sl6.4, i've enabled the nfs version 4.1 on the server (from my 
understanding, 4.0 should be enough?).

i would like to test if the replicas features can be used for failover 
support of a rw nfs export. ie
a. mount nfs from server1 on client
b. start some IO activity on client on the mounted filesystem
c. poweroff server1
d. after a certain amount of time, IO continues using server2

(the client i'm testing with is also el6.4 atm.)


many thanks,

stijn

Re: replicas and client support

[J. Bruce Fields]

On Mon, Apr 15, 2013 at 05:43:32PM +0200, Stijn De Weirdt wrote:
> (pls keep me in cc, i'm not subscribed to this list)
> 
> i am trying out the replicas feature of exportfs, but i'm unable to
> get it working.
> 
> i would like to know if what i'm trying to is actually implemented
> in linux (or intended behaviour of replicas in the first place).
> 
> 2 nfs4 servers with cluster filesystem (gpfs in my case). the os is
> sl6.4, i've enabled the nfs version 4.1 on the server (from my
> understanding, 4.0 should be enough?).
> 
> i would like to test if the replicas features can be used for
> failover support of a rw nfs export. ie
> a. mount nfs from server1 on client
> b. start some IO activity on client on the mounted filesystem
> c. poweroff server1
> d. after a certain amount of time, IO continues using server2
> 
> (the client i'm testing with is also el6.4 atm.)

No, the client has no support I'm aware of for failover to replicas.

--b.