[gpfsug-discuss] GPFS 4.1.1 without QoS for mmrestripefs?

[Buterbaugh, Kevin L]

Sven,

It’s been a while since I tried that, but the last time I tried to limit the impact of a restripe by only running it on a few NSD server nodes it made things worse.  Everybody was as slowed down as they would’ve been if I’d thrown every last NSD server we have at it and they were slowed down for longer, since using fewer NSD servers meant the restripe ran longer.

What we do is always kick off restripes on a Friday afternoon, throw every NSD server we have at them, and let them run over the weekend.  Interactive use is lower then and people don’t notice or care if their batch jobs run longer.

Of course, this is all just my experiences.  YMMV...

Kevin

On Jul 1, 2015, at 9:21 AM, Sven Oehme <oehmes at us.ibm.com<mailto:oehmes at us.ibm.com>> wrote:


Daniel,

as you know, we can't discuss future / confidential items on a mailing list.
what i presented as an outlook to future releases hasn't changed from a technical standpoint, we just can't share a release date until we announce it official.
there are multiple ways today to limit the impact on restripe and other tasks, the best way to do this is to run the task ( using -N) on a node (or very small number of nodes) that has no performance critical role. while this is not perfect, it should limit the impact significantly. .

sven

------------------------------------------
Sven Oehme
Scalable Storage Research
email: oehmes at us.ibm.com<mailto:oehmes at us.ibm.com>
Phone: +1 (408) 824-8904
IBM Almaden Research Lab
------------------------------------------

<graycol.gif>Daniel Vogel ---07/01/2015 03:29:11 AM---Hi Years ago, IBM made some plan to do a implementation "QoS for mmrestripefs, mmdeldisk...". If a "

From: Daniel Vogel <Daniel.Vogel at abcsystems.ch<mailto:Daniel.Vogel at abcsystems.ch>>
To: "'gpfsug-discuss at gpfsug.org<mailto:gpfsug-discuss at gpfsug.org>'" <gpfsug-discuss at gpfsug.org<mailto:gpfsug-discuss at gpfsug.org>>
Date: 07/01/2015 03:29 AM
Subject: [gpfsug-discuss] GPFS 4.1.1 without QoS for mmrestripefs?
Sent by: gpfsug-discuss-bounces at gpfsug.org<mailto:gpfsug-discuss-bounces at gpfsug.org>

________________________________



Hi

Years ago, IBM made some plan to do a implementation “QoS for mmrestripefs, mmdeldisk…”. If a “mmfsrestripe” is running, very poor performance for NFS access.
I opened a PMR to ask for QoS in version 4.1.1 (Spectrum Scale).

PMR 61309,113,848:
I discussed the question of QOS with the development team. These
command changes that were noticed are not meant to be used as GA code
which is why they are not documented. I cannot provide any further
information from the support perspective.


Anybody knows about QoS? The last hope was at “GPFS Workshop Stuttgart März 2015” with Sven Oehme as speaker.

Daniel Vogel
IT Consultant

ABC SYSTEMS AG
Hauptsitz Zürich
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T +41 43 433 6 433
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http://www.abcsystems.ch<http://www.abcsystems.ch/>

ABC - Always Better Concepts. Approved By Customers since 1981.
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Kevin Buterbaugh - Senior System Administrator
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