Am 18.02.16 um 08:59 schrieb Dale Ghent:
Are you using NFS over TCP or UDP?
If using it over TCP, I would expect the TCP connection to get momentarily
unhappy when its connection stalls and packets might need to be retransmitted
after the floating IP's new MAC address is asserted. Have you tried UDP instead?
/dale
On Feb 18, 2016, at 1:13 AM, Stephan Budach <stephan.bud...@jvm.de> wrote:
Hi,
I have been test driving RSF-1 for the last week to accomplish the following:
- cluster a zpool, that is made up from 8 mirrored vdevs, which are based on 8
x 2 SSD mirrors via iSCSI from another OmniOS box
- export a nfs share from above zpool via a vip
- have RSF-1 provide the fail-over and vip-moving
- use the nfs share as a repository for my Oracle VM guests and vdisks
The setup seems to work fine, but I do have one issue, I can't seem to get solved.
Whenever I failover the zpool, any inflight nfs data, will be stalled for some
unpredictable time. Sometimes it takes not much longer than the "move" time of
the resources but sometimes it takes up to 5 mins. until the nfs client on my VM server
becomes alive again.
So, when I issue a simple ls -l on the folder of the vdisks, while the
switchover is happening, the command somtimes comcludes in 18 to 20 seconds,
but sometime ls will just sit there for minutes.
I wonder, if there's anything, I could do about that. I have already played
with several timeouts, nfs wise and tcp wise, but nothing seem to yield any
effect on this issue. Anyone, who knows some tricks to speed up the inflight
data?
Thanks,
Stephan
Yes, NFS is using tcp for it's connection and naturally, this connection
will hang as long as the connection is broken. However, when ping starts
working again, all access to the NFS share as of that instance works.
But… if I issue a ls on the NFS share, while the ping is not yet
responding, the whole NFS connection hangs until it becomes working
again and that seems can take a lot of time.
I will try UDP instead of tcp and see, if I can get better results with
that.
Thanks,
Stephan
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