Upon further thought, it occurs to me that Spectrum Scale V5's introduction of variable sub-blocks must by necessity have changed the inode calculation that I describe below. I would be interested to know how exactly in Spectrum Scale V5 formatted file systems, how one may need to change the information I document below.
I would imagine the pre-V5 file system format probably still uses the inode allocation schema that I document below. John Sing IBM Offering Evangelist, Spectrum Scale, ESS Venice FL From: John M Sing/Tampa/IBM To: [email protected] Date: 03/06/2019 11:23 AM Subject: Question about inodes increase - how to increase non-disruptively - orig question by Mladen Portak on 3/6/19 - 09:46 GMT Hi, all, Mladen, (This is my first post to the GPFSug-discuss list. I am IBMer, am the IBM worldwide technical support Evangelist on Spectrum Scale/ESS. I am based in Florida. Apologies if my attachment is not permitted or if I did not reply properly to tie my reply to the original poster - pls let me know if there are more instructions or rules for using GPFSug-discuss (I could not find any such guidelines)). ------------- Mladen, Increasing or changing inodes in a GPFS/Spectrum Scale file system can be done non-disruptively, within the boundaries of how GPFS / Spectrum Scale works. I wrote and delivered the following presentation on this topic back in 2013 in the GPFS V4.1 timeframe. While older IBM technologies SONAS/V7000 Unified are the reason the preso was written, and the commands shown are from those now-withdrawn products, the GPFS concepts involved as far as I know have not changed, and you can simply use the GPFS/Spectrum Scale equivalent commands such as mmcrfs, mmcrfileset, mmchfileset, etc to allocate, add, or change inodes non-disruptively, within the boundaries of how GPFS / Spectrum Scale works. There's lots of diagrams. [attachment "sDS05_John_Sing_SONAS_V7000_GPFS_Unified_Independent_Filesets_Inode_Planning.ppt" deleted by John M Sing/Tampa/IBM] The PPT is handy because there is animation in Slideshow mode to better explain (at least in my mind) how GPFS allocates inodes, and how you extend or under what circumstances you can change the number of inodes in either a file system or an independent file set. Here is a Box link to download this 8.7MB preso, should the attachment not come thru or be too big for the list. https://ibm.box.com/shared/static/phn9dypcdbzyn2ei6hy2hc79lgmch904.ppt This Box link, which anyone who has the link can use to download, will expire on Dec 31, 2019. If you are reading this post past that date, just email me and I will be happy to reshare the preso with you. I wrote this up because I myself needed to remember inode allocation especially in light of how GPFS independent filesets works, should I ever need to refer back to it. Happy to hear feedback on the above preso from all of you out there. Corrections/comments/update suggestions welcome. Regards, John M. Sing Offering Evangelist, IBM Spectrum Scale, Elastic Storage Server, Spectrum NAS Venice, Florida https://www.linkedin.com/in/johnsing/ [email protected] office: 941-492-2998 ------------------------------------------------------------------------------------------------------------------------------------------------------------- Mladen Portak mladen.portak at hr.ibm.com wrote on Wed Mar 6 09:49:13 GMT 2019 Dear. is it process of increasing inodes disruptive? Thank You Mladen Portak Lab Service SEE Storage Consultant mladen.portak at hr.ibm.com +385 91 6308 293 IBM Hrvatska d.o.o. za proizvodnju i trgovinu Miramarska 23, 10 000 Zagreb, Hrvatska Upisan kod Trgovačkog suda u Zagrebu pod br. 080011422 Temeljni kapital: 788,000.00 kuna - uplaćen u cijelosti Direktor: Željka Tičić Žiro račun kod: RAIFFEISENBANK AUSTRIA d.d. Zagreb, Magazinska cesta 69, 10000 Zagreb, Hrvatska IBAN: HR5424840081100396574 (SWIFT RZBHHR2X); OIB 43331467622
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