This is where my confusion sits. So if I have two sites, and two NDS Nodes per
site with 1 NSD (to keep it simple), do I just present the physical LUN in
Site1 to Site1 NDS Nodes and physical LUN in Site2 to Site2 NSD Nodes? Or is
it that I present physical LUN in Site1 to all 4 NDS Nodes and the same at
Site2? (Assuming SAN and not direct attached in this case). I know I’m being
persistent but this for some reason confuses me.
Site1
NSD Node1
---NSD1 ---Physical LUN1 from SAN1
NSD Node2
Site2
NSD Node3
---NSD2 –Physical LUN2 from SAN2
NSD Node4
Or
Site1
NSD Node1
----NSD1 –Physical LUN1 from SAN1
----NSD2 –Physical LUN2 from SAN2
NSD Node2
Site 2
NSD Node3
---NSD2 – Physical LUN2 from SAN2
---NSD1 --Physical LUN1 from SAN1
NSD Node4
Site 3
Node5 Quorum
From: <[email protected]> on behalf of Ken Hill
<[email protected]>
Reply-To: gpfsug main discussion list <[email protected]>
Date: Wednesday, July 20, 2016 at 7:02 PM
To: gpfsug main discussion list <[email protected]>
Subject: Re: [gpfsug-discuss] NDS in Two Site scenario
Yes - it is a cluster.
The sites should NOT be further than a MAN - or Campus network. If you're
looking to do this over a large distance - it would be best to choose another
GPFS solution (Multi-Cluster, AFM, etc).
Regards,
Ken Hill
Technical Sales Specialist | Software Defined Solution Sales
IBM Systems
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From: "[email protected]" <[email protected]>
To: gpfsug main discussion list <[email protected]>
Date: 07/20/2016 07:33 PM
Subject: Re: [gpfsug-discuss] NDS in Two Site scenario
Sent by: [email protected]
________________________________
So in this scenario Ken, can server3 see any disks in site1?
From: <[email protected]> on behalf of Ken Hill
<[email protected]>
Reply-To: gpfsug main discussion list <[email protected]>
Date: Wednesday, July 20, 2016 at 4:15 PM
To: gpfsug main discussion list <[email protected]>
Subject: Re: [gpfsug-discuss] NDS in Two Site scenario
Site1
Site2
Server1 (quorum 1)
Server3 (quorum 2)
Server2
Server4
SiteX
Server5 (quorum 3)
You need to set up another site (or server) that is at least power isolated (if
not completely infrastructure isolated) from Site1 or Site2. You would then set
up a quorum node at that site | location. This insures you can still access
your data even if one of your sites go down.
You can further isolate failure by increasing quorum (odd numbers).
The way quorum works is: The majority of the quorum nodes need to be up to
survive an outage.
- With 3 quorum nodes you can have 1 quorum node failures and continue
filesystem operations.
- With 5 quorum nodes you can have 2 quorum node failures and continue
filesystem operations.
- With 7 quorum nodes you can have 3 quorum node failures and continue
filesystem operations.
- etc
Please see
http://www.ibm.com/support/knowledgecenter/en/STXKQY_4.2.0/ibmspectrumscale42_content.html?view=kcfor
more information about quorum and tiebreaker disks.
Ken Hill
Technical Sales Specialist | Software Defined Solution Sales
IBM Systems
________________________________
Phone:1-540-207-7270
E-mail: [email protected]<mailto:[email protected]>
[cid:[email protected]]<http://www.ibm.com/us-en/>
[cid:[email protected]]
<http://www-03.ibm.com/systems/platformcomputing/products/lsf/>
[cid:[email protected]]
<http://www-03.ibm.com/systems/platformcomputing/products/high-performance-services/index.html>
[cid:[email protected]]
<http://www-03.ibm.com/systems/platformcomputing/products/symphony/index.html>
[cid:[email protected]]
<http://www-03.ibm.com/systems/storage/spectrum/>
[cid:[email protected]]
<http://www-01.ibm.com/software/tivoli/csi/cloud-storage/>
[cid:[email protected]]
<http://www-01.ibm.com/software/tivoli/csi/backup-recovery/>
[cid:[email protected]]
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From: "[email protected]" <[email protected]>
To: gpfsug main discussion list <[email protected]>
Date: 07/20/2016 04:47 PM
Subject: [gpfsug-discuss] NDS in Two Site scenario
Sent by: [email protected]
________________________________
For some reason this concept is a round peg that doesn’t fit the square hole
inside my brain. Can someone please explain the best practice to setting up
two sites same cluster? I get that I would likely have two NDS nodes in site 1
and two NDS nodes in site two. What I don’t understand are the failure
scenarios and what would happen if I lose one or worse a whole site goes down.
Do I solve this by having scale replication set to 2 for all my files? I mean
a single site I think I get it’s when there are two datacenters and I don’t
want two clusters typically.
Mark R. Bush| Solutions Architect
Mobile: 210.237.8415 | [email protected]
Sirius Computer Solutions | www.siriuscom.com<http://www.siriuscom.com/>
10100 Reunion Place, Suite 500, San Antonio, TX 78216
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