[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>
> 
> 
> 
> 
>     My Notifications for Storage - 30 Jun 2017
> 
>     Dear Subscriber (aaron.s.knister at nasa.gov
>     <mailto: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
>     <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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