<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" >Bob,</div>
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<div dir="ltr" >from what you describe I would assume that you have now "old" vdisks that span four enclosures and "new" vdisks that span the two new enclosures. So you already are unbalanced at the vdisk level. From a performance point I would guess the optimum would be to have the new NSDs being half the size of the old ones. But honestly I do not know how much of a difference it really makes.</div>
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<div dir="ltr" >Fred is right, if you can you shoud always go for a homogenous setup. On the other hand if you can't, you can't.</div>
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<div dir="ltr" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div dir="ltr" ><font face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2" ><font face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2" ><font face="Arial" size="2" >Mit freundlichen Grüßen / Kind regards</font> </font> </font>
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<blockquote data-history-content-modified="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- Original message -----<br>From: "Frederick Stock" <stockf@us.ibm.com><br>Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>To: gpfsug-discuss@spectrumscale.org<br>Cc: gpfsug-discuss@spectrumscale.org<br>Subject: [EXTERNAL] Re: [gpfsug-discuss] ESS - Considerations when adding NSD space?<br>Date: Thu, Oct 24, 2019 17:55<br>
<div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:12pt" ><div dir="ltr" >Bob as I understand having different size NSDs is still not considered ideal even for ESS. I had another customer recently add storage to an ESS system and they were advised to first check the size of their current vdisks and size the new vdisks to be the same. </div>
<div dir="ltr" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" ><br><font face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2" ><span style="font-size:1.143em;" >Fred<br>__________________________________________________<br>Fred Stock | IBM Pittsburgh Lab | 720-430-8821<br>stockf@us.ibm.com</span></font></div></div></div>
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<blockquote data-history-content-modified="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- Original message -----<br>From: "Oesterlin, Robert" <Robert.Oesterlin@nuance.com><br>Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>Cc:<br>Subject: [EXTERNAL] [gpfsug-discuss] ESS - Considerations when adding NSD space?<br>Date: Thu, Oct 24, 2019 11:34 AM<br> <br><!--Notes ACF
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<div><p style="margin: 0px;" ><span style="font-size:11.0pt" >We recently upgraded our GL4 to a GL6 (trouble free process for those considering FYI). I now have 615T free (raw) in each of my recovery groups. I’d like to increase the size of one of the file systems (currently at 660T, I’d like to add 100T).<o:p></o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" ><o:p> </o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" >My first thought was going to be:<o:p></o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" ><o:p> </o:p></span></p>
<p style="margin: 0px;" >mmvdisk vdiskset define --vdisk-set fsdata1 --recovery-group rg_gssio1-hs,rg_gssio2-hs --set-size 50T --code 8+2p --block-size 4m --nsd-usage dataOnly --storage-pool data<o:p></o:p></p>
<p style="margin: 0px;" >mmvdisk vdiskset create --vdisk-set fs1data1 <o:p></o:p></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" >mmvdisk filesystem add --filesystem fs1 </span>--vdisk-set fs1data1 <span style="font-size:11.0pt" ><o:p></o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" ><o:p> </o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" >I know in the past use of mixed size NSDs was frowned upon, not sure on the ESS. <o:p></o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" ><o:p> </o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" >The other approach would be add two larger NSDs (current ones are 330T) of 380T, migrate the data to the new ones using mmrestripe, then delete the old ones. The other benefit of this process would be to have the file system data better balanced across all the storage enclosures.<o:p></o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" ><o:p> </o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" >Any considerations before I do this? Thoughts?<o:p></o:p></span></p>
<p style="margin: 0px;" ><span style="font-size:11.0pt" ><o:p> </o:p></span></p>
<p style="margin: 0px;" >Bob Oesterlin<o:p></o:p></p>
<p style="margin: 0px;" >Sr Principal Storage Engineer, Nuance<o:p></o:p></p>
<p style="margin: 0px;" ><o:p> </o:p></p></div>
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