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 <[email protected]
<mailto:[email protected]>> 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 <[email protected]
<mailto:[email protected]>>
To: gpfsug main discussion list <[email protected]
<mailto:[email protected]>>
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: [email protected]
<mailto:[email protected]>
------------------------------------------------------------------------
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
<[email protected] <mailto:[email protected]>>
To: [email protected] <mailto:[email protected]>
My Notifications for Storage - 30 Jun 2017
Dear Subscriber ([email protected]
<mailto:[email protected]>),
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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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NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
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