Re: [gpfsug-discuss] Strategies - servers with local SAS disks

[Andrew Beattie]

Bob,

 

If your not going to use integrated Raid controllers in the servers, then FPO would seem to be the most resilient scenario.

yes it has its own overheads, but with that many drives to manage, a JOBD architecture and manual restriping doesn't sound like fun

 

If you are going down the path of integrated raid controllers then any form of distributed raid is probably the best scenario, Raid 6 obviously.

 

How many Nodes are you planning on building?  The more nodes the more value FPO is likely to bring as you can be more specific in how the data is written to the nodes.

 

Andrew Beattie

Software Defined Storage  - IT Specialist

Phone: 614-2133-7927

E-mail: abeat...@au1.ibm.com

 

 

----- Original message -----
From: "Oesterlin, Robert" <robert.oester...@nuance.com>
Sent by: gpfsug-discuss-boun...@spectrumscale.org
To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org>
Cc:
Subject: [gpfsug-discuss] Strategies - servers with local SAS disks
Date: Thu, Dec 1, 2016 12:34 AM
 

Looking for feedback/strategies in setting up several GPFS servers with local SAS. They would all be part of the same file system. The systems are all similar in configuration - 70 4TB drives.

 

Options I’m considering:

 

- Create RAID arrays of the disks on each server (worried about the RAID rebuild time when a drive fails with 4, 6, 8TB drives)

- No RAID with 2 replicas, single drive per NSD. When a drive fails, recreate the NSD – but then I need to fix up the data replication via restripe

- FPO – with multiple failure groups -  letting the system manage replica placement and then have GPFS due the restripe on disk failure automatically

 

Comments or other ideas welcome.

 

Bob Oesterlin
Sr Principal Storage Engineer, Nuance
507-269-0413

 

 

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