Its also worth remembering that if you have too many vdisks, that you will potentially not get the full performance of all the drives in the RG
I think from memory you need to have a minimum of 5% of the RG as the size of the vdisk (20 Vdisks per RG) to ensure that you spread the write of the data across
all the drives in the RG, this guarantees the best performance for each Vdisk
Andrew Beattie
File and Object Storage Technical Specialist - A/NZ
IBM Systems - Storage
Phone: 614-2133-7927
E-mail: abeat...@au1.ibm.com
- Original message -From: "Olaf Weiser" Sent by: gpfsug-discuss-boun...@spectrumscale.orgTo: gpfsug main discussion list Cc:Subject: [EXTERNAL] Re: [gpfsug-discuss] Max number of vdisks in a recovery group - is it 64?Date: Fri, Dec 13, 2019 10:20 PM Hallo Heiner, Stefan, thx for this heads up ..we know ... it's all GNR .. so the answer is a bit different, depending on the scenario on the regular building blocks.. the RG Layout (2 RGs per BB) .. is different from the scale out ECE (#4+ nodes, one RG ) The absolute max #vdisk is ( I think ) 512 per RG - but I would not recommend to go that far , when designing a data layout .. if ever possible.. we can have a short talk next week on that.. Try to keep the #vdisk as small as you can is the better approach .. From: "Dietrich, Stefan" To: gpfsug main discussion list Date: 12/13/2019 02:26 AMSubject: [EXTERNAL] Re: [gpfsug-discuss] Max number of vdisks in a recovery group - is it 64?Sent by: gpfsug-discuss-boun...@spectrumscale.org
Hello Heiner,the 64 vdisk limit per RG is still present in the latest ESS docs:https://www.ibm.com/support/knowledgecenter/SSYSP8_5.3.5/com.ibm.spectrum.scale.raid.v5r04.adm.doc/bl1adv_vdisks.htmFor the other questions, no idea.Regards,Stefan- Original Message -> From: "Billich Heinrich Rainer (ID SD)" > To: "gpfsug main discussion list" > Sent: Thursday, December 12, 2019 3:26:31 PM> Subject: [gpfsug-discuss] Max number of vdisks in a recovery group - is it 64?> Hello,>> I remember that a GNR/ESS recovery group can hold up to 64 vdisks, but I can’t> find a citation to proof it. Now I wonder if 64 is the actual limit? And where> is it documented? And did the limit change with versions? Thank you. I did> spend quite some time searching the documentation, no luck .. maybe you know.>> We run ESS 5.3.4.1 and the recovery groups have current/allowable format> version 5.0.0.0>> Thank you,>> Heiner> --> ===> Heinrich Billich> ETH Zürich> Informatikdienste> Tel.: +41 44 632 72 56> heinrich.bill...@id.ethz.ch> > ___> gpfsug-discuss mailing list> gpfsug-discuss at spectrumscale.org> http://gpfsug.org/mailman/listinfo/gpfsug-discuss___gpfsug-discuss mailing listgpfsug-discuss at spectrumscale.orghttp://gpfsug.org/mailman/listinfo/gpfsug-discuss
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