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

Sobey, Richard A r.sobey at imperial.ac.uk
Sat Nov 12 20:39:07 GMT 2016


Sorry... one of the quorum nodes. 

-----Original Message-----
From: gpfsug-discuss-bounces at spectrumscale.org [mailto:gpfsug-discuss-bounces at spectrumscale.org] On Behalf Of Valdis.Kletnieks at vt.edu
Sent: 12 November 2016 20:24
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Subject: Re: [gpfsug-discuss] How to clear stale entries in GUI log

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)



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