[gpfsug-discuss] V5 Experience -- maxblocksize

Fri Feb 9 13:58:58 GMT 2018

All,

Correct. There is no need to change the value of 'maxblocksize' for
existing clusters which are upgraded to the 5.0.0 level. If a new file
system needs to be created with a block size which exceeds the value of
maxblocksize then the mmchconfig needs to be issued to increase the value
of maxblocksize (which requires the entire cluster to be stopped).

For clusters newly created with 5.0.0, the value of maxblocksize is set to
4MB.  See the references to maxblocksize in the mmchconfig and mmcrfs man
pages in 5.0.0 .

 Felipe

----
Felipe Knop                                     knop at us.ibm.com
GPFS Development and Security
IBM Systems
IBM Building 008
2455 South Rd, Poughkeepsie, NY 12601
(845) 433-9314  T/L 293-9314

From:	"Uwe Falke" <UWEFALKE at de.ibm.com>
To:	gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:	02/09/2018 06:54 AM
Subject:	Re: [gpfsug-discuss] V5 Experience
Sent by:	gpfsug-discuss-bounces at spectrumscale.org

I suppose the new maxBlockSize default is <>1MB, so your config parameter
was properly translated. I'd see no need to change anything.

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:   "Grunenberg, Renar" <Renar.Grunenberg at huk-coburg.de>
To:     "'gpfsug-discuss at spectrumscale.org'"
<gpfsug-discuss at spectrumscale.org>
Date:   02/09/2018 10:16 AM
Subject:        [gpfsug-discuss] V5 Experience
Sent by:        gpfsug-discuss-bounces at spectrumscale.org

Hallo All,
we updated our Test-Cluster from 4.2.3.6 to V5.0.0.1. So good so fine, but
I see after the mmchconfig release=LATEST a new common parameter
?maxblocksize 1M?
(our fs are on these blocksizes) is happening.
Ok, but if I will change this parameter the hole cluster was requestet
that:

  root @sbdl7003(rhel7.4)> mmchconfig maxblocksize=DEFAULT
Verifying GPFS is stopped on all nodes ...
mmchconfig: GPFS is still active on SAPL7012x1.t7.lan.tuhuk.de
mmchconfig: GPFS is still active on SBDL7001x1.t7.lan.tuhuk.de
mmchconfig: GPFS is still active on SAPL7013x1.t7.lan.tuhuk.de
mmchconfig: GPFS is still active on SAPL7009x1.t7.lan.tuhuk.de
mmchconfig: GPFS is still active on SAPL7008x1.t7.lan.tuhuk.de
mmchconfig: GPFS is still active on SBDL7003x1.t7.lan.tuhuk.de
mmchconfig: GPFS is still active on SBDL7004x1.t7.lan.tuhuk.de
mmchconfig: GPFS is still active on SAPL7001x1.t7.lan.tuhuk.de
mmchconfig: Command failed. Examine previous error messages to determine
cause.
Can someone explain the behavior here, and same clarification in an update
plan what can we do to go to the defaults without clusterdown.
Is this a bug or a feature;-)

Regards Renar
Renar Grunenberg
Abteilung Informatik ? Betrieb

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