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

2018-04-08 Thread valdis . kletnieks
On Sat, 07 Apr 2018 20:27:49 +0300, "Yaron Daniel" said: > Main items to take into account : > 1) What is the latecny you have between the 2 main sites ? > 2) What network bandwidth between the 2 sites ? > 3) What is the latency to the 3rd site from each site ? > 4) Which protocols plan to be used

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

2018-04-07 Thread Yaron Daniel
HI We have few customers than have 2 Sites (Active/Active using SS replication) + 3rd site as Quorum Tie Breaker node. 1) Spectrum Scale 4.2.3.x 2) Lenovo x3650 -M4 connect via FC to SVC (Flash900 as external storage) 3) We run all tests before deliver the system to customer Production. Main it

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

2018-04-06 Thread 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