[gpfsug-discuss] Fwd: FLASH: IBM Spectrum Scale (GPFS): RDMA-enabled network adapter failure on the NSD server may result in file IO error (2017.06.30)
Aaron Knister
aaron.s.knister at nasa.gov
Fri Jun 30 18:53:16 BST 2017
In fact the answer was quite literally "no":
https://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=84523
(the RFE was declined and the answer was that the "function is already
available in GNR environments").
Regarding GNR, see this RFE request
https://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=95090
requesting the use of GNR outside of an ESS/GSS environment. It's
interesting to note this is the highest voted Public RFE for GPFS that I
can see, at least. It too was declined.
-Aaron
On 6/30/17 1:41 PM, Aaron Knister wrote:
> Thanks Olaf, that's good to know (and is kind of what I suspected). I've
> requested a number of times this capability for those of us who can't
> use or aren't using GNR and the answer is effectively "no". This
> response is curious to me because I'm sure IBM doesn't believe that data
> integrity is only important and of value to customers who purchase their
> hardware *and* software.
>
> -Aaron
>
> On Fri, Jun 30, 2017 at 1:37 PM, Olaf Weiser <olaf.weiser at de.ibm.com
> <mailto:olaf.weiser at de.ibm.com>> wrote:
>
> yes.. in case of GNR (GPFS native raid) .. we do end-to-end
> check-summing ... client --> server --> downToDisk
> GNR writes down a chksum to disk (to all pdisks /all "raid" segments
> ) so that dropped writes can be detected as well as miss-done
> writes (bit flips..)
>
>
>
> From: Aaron Knister <aaron.s.knister at nasa.gov
> <mailto:aaron.s.knister at nasa.gov>>
> To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org
> <mailto:gpfsug-discuss at spectrumscale.org>>
> Date: 06/30/2017 07:15 PM
> Subject: [gpfsug-discuss] Fwd: FLASH: IBM Spectrum Scale (GPFS):
> RDMA-enabled network adapter failure on the NSD server may result in
> file IO error (2017.06.30)
> Sent by: gpfsug-discuss-bounces at spectrumscale.org
> <mailto:gpfsug-discuss-bounces at spectrumscale.org>
> ------------------------------------------------------------------------
>
>
>
> I'm curious to know why this doesn't affect GSS/ESS? Is it a feature of
> the additional check-summing done on those platforms?
>
>
> -------- Forwarded Message --------
> Subject: FLASH: IBM Spectrum Scale (GPFS): RDMA-enabled network
> adapter
> failure on the NSD server may result in file IO error (2017.06.30)
> Date: Fri, 30 Jun 2017 14:19:02 +0000
> From: IBM My Notifications
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> To: aaron.s.knister at nasa.gov <mailto:aaron.s.knister at nasa.gov>
>
>
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>
> My Notifications for Storage - 30 Jun 2017
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> Dear Subscriber (aaron.s.knister at nasa.gov
> <mailto:aaron.s.knister at nasa.gov>),
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> 1. IBM Spectrum Scale
>
> - TITLE: IBM Spectrum Scale (GPFS): RDMA-enabled network adapter
> failure
> on the NSD server may result in file IO error
> - URL:
> http://www.ibm.com/support/docview.wss?uid=ssg1S1010233&myns=s033&mynp=OCSTXKQY&mynp=OCSWJ00&mync=E&cm_sp=s033-_-OCSTXKQY-OCSWJ00-_-E
> <http://www.ibm.com/support/docview.wss?uid=ssg1S1010233&myns=s033&mynp=OCSTXKQY&mynp=OCSWJ00&mync=E&cm_sp=s033-_-OCSTXKQY-OCSWJ00-_-E>
> - ABSTRACT: IBM has identified an issue with all IBM GPFS and IBM
> Spectrum Scale versions where the NSD server is enabled to use RDMA for
> file IO and the storage used in your GPFS cluster accessed via NSD
> servers (not fully SAN accessible) includes anything other than IBM
> Elastic Storage Server (ESS) or GPFS Storage Server (GSS); under these
> conditions, when the RDMA-enabled network adapter fails, the issue may
> result in undetected data corruption for file write or read operations.
>
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--
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776
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