[Gluster-users] network.ping-timeout details

[Pranith Kumar Karampuri]

hi,
Do you think you have any workload you can generate to see the kind of 
latency numbers your setup has?
You can probably use 'gluster volume profile <volname> start/info/stop' 
to figure out the maximum latencies and configure a number closer to the 
numbers you get in this profile?

The following contains steps to perform profiling.
http://gluster.org/community/documentation/index.php/Gluster_3.2:_Running_Gluster_Volume_Profile_Command

HTH
Pranith

On 08/05/2014 06:53 PM, Scott Merrill wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
>
> Hello!
>
> I've read the description for the network.ping-timeout option, but the
> admonishment at the end isn't particularly helpful:
>
> "This reconnect is a very expensive operation and should be avoided."
>
> Can that be quantified at all? Does this boil down to a "thundering
> herd" problem, such that the problem is exacerbated by lots of
> clients?  If the client count is relatively low, is the problem
> reduced in any way?
>
> The bot in #gluster provides a little more info, but not enough:
>
> "The reason for the long (42 second) ping-timeout is because
> re-establishing fd's and locks can be a very expensive operation.
> Allowing a longer time to reestablish connections is logical, unless
> you have servers that frequently die."
>
>
> If I'm using a distributed replicated volume to ensure availability of
> my data, it seems sub-optimal to block all Gluster I/O for 42 seconds.
>
> Is there guidance on how to balance the timeout for different scenarios?
>
> My searching hasn't provided much useful insight on the matter. If
> there are documents available online for me to review, I'll happily
> read them.
>
> Thanks!
> Scott
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG/MacGPG2 v2.0.22 (Darwin)
> Comment: GPGTools - https://gpgtools.org
>
> iQIcBAEBCgAGBQJT4NraAAoJENjy5XvtDywKAyQP/jN60O2tEaw1r+zKiD5r1uav
> RjPrlsMZJ6S55HOt6wZ/i9H4u+skMHIgGeo5/4mTnkDzB6OybeSp3efv5l2rycxX
> IPhF3RCbpkSQa7il+5TldG21zHrfBlyf05LEFEMk6XqF6pswhIxjiWoOMjkKrY03
> IGXVRd6VV6CQ5dQMYprQr6XYs90tKxgWNzFwxTfyk1jaLHo07ocBz5L6b8gYiBg2
> 4oZgI9EJnahHferfZJwqkH1609sAc37akrauLRSyDzHYpwJTTgVhslwFW6dzFI2A
> U0GA95uuu4sOf4AhXOOHUTwWVeqHNBizQdJuP/KcVv/lX/eC+yC48o1gifPYLcJs
> EluIQdY6a3SknwHmaSNBRGfehc7sWUjO1Nrz2JFtjfjRAtEgGTNL0tiJkUKJxL2U
> UGhRSGF3dNz8DkqjrXVIyMXiujLIR3uLNsa/KqwaJvac1m82tJWu7pC4zva2XjjF
> j+d/4LNLznSfkyq4C+l5qAe8sM5L4GSgbJVsSiUecl432sV6RhgBTvE/Gbk2Klnb
> 1FXMYy10VFeSmDM4etoJsMxy0EjyLyQAMcO//GU+FV2kwr+wsTStMHoOzzqOApY+
> V5SFHjA18TFYxyN5DICLXTCn6J81aoJXnd7+cDWM0jOhUbhxtS7KSnidqWwj+TLH
> gV+5608dxtmFgOKCF/55
> =iDza
> -----END PGP SIGNATURE-----
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://supercolony.gluster.org/mailman/listinfo/gluster-users