[gpfsug-discuss] Experiences with Synchronous Replication, Stretch Clusters, and Spectrum Scale <= 4.2

[Sobey, Richard A]

Hi Stewart

We're running a synchronous replication cluster between our DCs in London and Slough, at a distance of ~63km. The latency is in the order of 700 microseconds over dark fibre.

Honestly... it's been a fine experience. We've never had a full connectivity loss mind you, but we have had to shut down one site fully whilst the other one carried on as normal. Mmrestripe afterwards of course.

We are running Scale version 4.2.3 and looking at v5. Hardware is IBM v3700 storage, IBM rackmount NSD/CES nodes. The storage is connected via FC.

Cheers
Richard

-----Original Message-----
From: gpfsug-discuss-bounces at spectrumscale.org <gpfsug-discuss-bounces at spectrumscale.org> On Behalf Of Howard, Stewart Jameson
Sent: 06 April 2018 16:15
To: gpfsug-discuss at spectrumscale.org
Subject: [gpfsug-discuss] Experiences with Synchronous Replication, Stretch Clusters, and Spectrum Scale <= 4.2

Hi All,

I was wondering what experiences the user group has had with stretch 4.x clusters.  Specifically, we're interested in:

1)  What SS version are you running?

2)  What hardware are you running it on?

3)  What has been your experience with testing of site-failover scenarios (e.g., full power loss at one site, interruption of inter- site link).

Thanks so much for your help!

Stewart
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