[gpfsug-discuss] How to clear stale entries in GUI log

[Valdis.Kletnieks at vt.edu]

On Fri, 11 Nov 2016 08:50:00 +0000, "Sobey, Richard A" said:
> Question: when I upgrade to the new PTF when it’s available, can I install it
> first on just the GUI node (which happens to be the Quorum server for the
> cluster)

*the* quorum server, not "one of the quorum nodes"?

Best practice is to have enough nodes designated as quorum nodes so
even if one of them is taken down for upgrade or maintenance, the cluster
as a whole remains up and serving data. That way, you can do rolling installs
of patches without taking an outage.

The number to pick depends on your config - we have one cluster with 4 NSD
servers, where we've defined all 4 as quorum nodes.  That way, as long as 3
of them (half plus 1) are up, the cluster stays up.  We have another stretch
cluster with 10 servers (5 at each node), and we defined 3 quorum nodes at
our main site, and 2 at the remote site, specifically so that if we did lose
the 10G link between sites, the main site would retain quorum and stay up.
(Losing the remote site is, in our setup, *much* less critical than ensuring the
main site stays up.  We replicate between the two, and if the remote is down,
and thus falls behind, mmrestripefs is available for cleaning up)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 484 bytes
Desc: not available
URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20161112/7a395b5b/attachment.sig>