I/O is frozen, so you don't get errors, just a delay when accessing. It's completly transparent, and for VM disks at least even 40 seconds is fine, not long enough for a web server to timeout, the visitor just thinks the site was slow for a minute.
Really hasn't been that bad here, but I guess it all depends on what the files are On Thu, Dec 28, 2017 at 12:57:21PM +1100, Sam McLeod wrote: > 10 seconds is a very long time for files to go away for applications used at > any scale, it is however what I've set our failover time to after being > shocked by the default of 42 seconds. > > -- > Sam McLeod > https://smcleod.net > https://twitter.com/s_mcleod > > > On 27 Dec 2017, at 10:17 pm, Omar Kohl <omar.k...@iternity.com> wrote: > > > > Hi, > > > >> If you set it to 10 seconds, and a node goes down, you'll see a 10 seconds > >> freez in all I/O for the volume. > > > > Exactly! ONLY 10 seconds instead of the default 42 seconds :-) > > > > As I said before the problem with the 42 seconds is that a Windows Samba > > Client will disconnect (and therefore interrupt any read/write operation) > > after waiting for about 25 seconds. So 42 seconds is too high. In this case > > it would therefore make more sense to reduce the ping-timeout, right? > > > > Has anyone done any performance measurements on what the implications of a > > low ping-timeout are? What are the costs of "triggering heals all the time"? > > > > On a related note I found the > > extras/hook-scripts/start/post/S29CTDBsetup.sh script that mounts a CTDB > > (Samba) share and explicitly sets the ping-timeout to 10 seconds. There is > > a comment saying: "Make sure ping-timeout is not default for CTDB volume". > > Unfortunately there is no explanation in the script, in the commit or in > > the Gerrit review history (https://review.gluster.org/#/c/7569/, > > https://review.gluster.org/#/c/8007/) for WHY you make sure ping-timeout is > > not default. Can anyone tell me the reason? > > > > Kind regards, > > Omar > > > > _______________________________________________ > Gluster-users mailing list > Gluster-users@gluster.org > http://lists.gluster.org/mailman/listinfo/gluster-users
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