[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]

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> 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>
> To:        gpfsug main discussion list <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
> ------------------------------
>
>
>
> 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 <mynotify at stg.events.ihost.com
> >
> To:                  aaron.s.knister at nasa.gov
>
>
>
>
> My Notifications for Storage - 30 Jun 2017
>
> Dear Subscriber (aaron.s.knister at nasa.gov),
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> Here are your updates from IBM My Notifications.
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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
> - 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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