[gpfsug-discuss] Strategies - servers with local SAS disks
Uwe Falke
UWEFALKE at de.ibm.com
Wed Nov 30 16:28:24 GMT 2016
I have once set up a small system with just a few SSDs in two NSD servers,
providin a scratch file system in a computing cluster.
No RAID, two replica.
works, as long the admins do not do silly things (like rebooting servers
in sequence without checking for disks being up in between).
Going for RAIDs without GPFS replication protects you against single disk
failures, but you're lost if just one of your NSD servers goes off.
FPO makes sense only sense IMHO if your NSD servers are also processing
the data (and then you need to control that somehow).
Other ideas? what else can you do with GPFS and local disks than what you
considered? I suppose nothing reasonable ...
Mit freundlichen Grüßen / Kind regards
Dr. Uwe Falke
IT Specialist
High Performance Computing Services / Integrated Technology Services /
Data Center Services
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From: "Oesterlin, Robert" <Robert.Oesterlin at nuance.com>
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date: 11/30/2016 03:34 PM
Subject: [gpfsug-discuss] Strategies - servers with local SAS disks
Sent by: gpfsug-discuss-bounces at spectrumscale.org
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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