Hi Jeff,
the non-disruptiveness also depends upon what protocol version you're using: Version 3 doesn't have sessions, so there's no session infos to be handed over to the partner... Versions 4/4.1 have sessions, but are supposed to handle reboots/takeovers more gracefully, also regarding locks.
Generally speaking "non-disruptive" means (not only in NetApp speak), that the disruption is less than the protocol timeout values (and there's no need to re-start a session). It does not mean, that there isn't a small period of non-responsiveness. Even SAN-protocols 'suffer' the same, e.g. when there's a path state change and ALUA/MPIO kicks in...
my 2c
Sebastian
On 29.05.2013 09:24, Jeff Cleverley wrote:
Rafal,
NetApp's definition of "non-disruptive" is generally not what most people consider non-disruptive :-) It does cause nfs outages during these modes. How much time varies by hardware, system load, etc. The time listed by the giveback is generally less than user wall clock time. The system may say the downtime was 45 seconds, but a time command from a client will usually be closer to 100 seconds before the filer starts responding again. That is why I generally do snapmirror migrations and cluster failovers in the middle of the night to minimize user complaints.
Jeff
On Wed, May 29, 2013 at 1:07 AM, Rafał Radecki <radecki.rafal@gmail.com mailto:radecki.rafal@gmail.com> wrote:
Hi All. I have two FAS3210 in 7-mode Actvie/Active. I perform takeover/gieback and see that the outage is visible for clients for nfs mounts. From your experiences should it be so? I think that information about nfs sessions and IP address are moved to the takeover node so in theory it should not be visible. Best regards, Rafal. _______________________________________________ Toasters mailing list Toasters@teaparty.net <mailto:Toasters@teaparty.net> http://www.teaparty.net/mailman/listinfo/toasters-- Jeff Cleverley Unix Systems Administrator 4380 Ziegler Road Fort Collins, Colorado 80525 970-288-4611
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