[gpfsug-discuss] Unbalanced pdisk free space

[IBM Spectrum Scale]

Alvise,

Could you send us the output of the following commands from both server 
nodes.
mmfsadm dump nspdclient > /tmp/dump_nspdclient.<nodeName> 
mmfsadm dump pdisk   > /tmp/dump_pdisk.<nodeName>

Regards, The Spectrum Scale (GPFS) team

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From:   "Dorigo Alvise (PSI)" <alvise.dorigo at psi.ch>
To:     "gpfsug-discuss at spectrumscale.org" 
<gpfsug-discuss at spectrumscale.org>
Date:   01/30/2019 08:24 AM
Subject:        [gpfsug-discuss] Unbalanced pdisk free space
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



Hello,
I've a Lenovo Spectrum Scale system DSS-G220 (software dss-g-2.0a) 
composed of
2x x3560 M5 IO server nodes
1x x3550 M5 client/support node
2x disk enclosures D3284
GPFS/GNR 4.2.3-7

Can anybody tell me if it is normal that all the pdisks of both my 
recovery groups, residing on the same physical enclosure have free space 
equal to (more or less) 1/3 of the free space of the pdisks residing on 
the other physical enclosure (see attached text files for the command line 
output) ?

I guess when the least free disks are fully occupied (while the others are 
still partially free) write performance will drop by a factor of two. 
Correct ? 
Is there a way (considering that the system is in production) to fix 
(rebalance) this free space among all pdisk of both enclosures ?

Should I open a PMR to IBM ?

Many thanks,

   Alvise

[attachment "rg1" deleted by Brian Herr/Poughkeepsie/IBM] [attachment 
"rg2" deleted by Brian Herr/Poughkeepsie/IBM] 
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