<div dir="auto">We are doing the similar procedure right now. Migrating from one group of nsd servers to another.<div dir="auto">Unfortunately, as I understand, if you can't afford the cluster/filesystem downtime and not ready for 5.0 upgrade yet ( personally I'm not comfortable with ".0" versions of software in production :) ) - the only way to do it is remove disk/nsd from filesystem and add it back with the new servers list.</div><div dir="auto"><br></div><div dir="auto">Taking a while , a lot of i/o ...</div><div dir="auto"><br></div><div dir="auto">John, in case the single nsd filesystem, I'm afraid, you'll have to unmount it to change ....</div><div dir="auto"><br></div><div dir="auto">--Alex</div><div dir="auto"><br></div><br><br><div class="gmail_quote" dir="auto"><div dir="ltr">On Wed, Apr 4, 2018, 2:25 PM Buterbaugh, Kevin L <<a href="mailto:Kevin.Buterbaugh@vanderbilt.edu">Kevin.Buterbaugh@vanderbilt.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Hi John,
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</div>
<div>Yes, you can remove one of the servers and yes, we’ve done it and yes, the documentation is clear and correct. ;-)</div>
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<div>Last time I did this we were in a full cluster downtime, so unmounting wasn’t an issue. We were changing our network architecture and so the IP addresses of all NSD servers save one were changing. It was a bit … uncomfortable … for the brief
period of time I had to make the one NSD server the one and only NSD server for ~1 PB of storage! But it worked just fine…</div>
<div><br>
</div>
<div>HTHAL…</div>
<div><br>
</div>
<div>Kevin<br>
<div><br>
<blockquote type="cite">
<div>On Apr 4, 2018, at 4:11 AM, John Hearns <<a href="mailto:john.hearns@asml.com" target="_blank" rel="noreferrer">john.hearns@asml.com</a>> wrote:</div>
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I should say I already have a support ticket open for advice on this issue.<u></u><u></u></div>
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We have a filesystem which has NSDs which have two servers defined, for instance:<u></u><u></u></div>
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nsd:<u></u><u></u></div>
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device=/dev/sdb<u></u><u></u></div>
<div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">
servers=sn007,sn008<u></u><u></u></div>
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nsd=nsd1<u></u><u></u></div>
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usage=dataOnly<u></u><u></u></div>
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<u></u> <u></u></div>
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Can I remove one of these servers? The object is to upgrade this server and change its hostname, the physical server will stay in place.<u></u><u></u></div>
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Has anyone carried out an operation similar to this?<u></u><u></u></div>
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<u></u> <u></u></div>
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I guess the documentation here is quite clear:<u></u><u></u></div>
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<a href="https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ibm.com%2Fdeveloperworks%2Fcommunity%2Fwikis%2Fhome%3Flang%3Den%23!%2Fwiki%2FGeneral%2520Parallel%2520File%2520System%2520(GPFS)%2Fpage%2FNSD%2520server%2520balance&data=02%7C01%7CKevin.Buterbaugh%40vanderbilt.edu%7Cf2ffa137afda4368e32708d59a5c513c%7Cba5a7f39e3be4ab3b45067fa80faecad%7C0%7C1%7C636584643653030858&sdata=XYE5TGimxvz54s87MPmOcK%2Fh6Fkyfmx1CpeSpF1P5DM%3D&reserved=0" style="color:purple;text-decoration:underline" target="_blank" rel="noreferrer">https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20(GPFS)/page/NSD%20server%20balance</a><u></u><u></u></div>
<div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">
“<span lang="EN">If you want to change configuration for a NSD which is already belongs to a file system, you need to unmount the file system before running mmchnsd command.”</span><u></u><u></u></div>
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