We are doing the similar procedure right now. Migrating from one group of nsd servers to another. 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.
Taking a while , a lot of i/o ... John, in case the single nsd filesystem, I'm afraid, you'll have to unmount it to change .... --Alex On Wed, Apr 4, 2018, 2:25 PM Buterbaugh, Kevin L < kevin.buterba...@vanderbilt.edu> wrote: > Hi John, > > Yes, you can remove one of the servers and yes, we’ve done it and yes, the > documentation is clear and correct. ;-) > > 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… > > HTHAL… > > Kevin > > On Apr 4, 2018, at 4:11 AM, John Hearns <john.hea...@asml.com> wrote: > > I should say I already have a support ticket open for advice on this issue. > We have a filesystem which has NSDs which have two servers defined, for > instance: > nsd: > device=/dev/sdb > servers=sn007,sn008 > nsd=nsd1 > usage=dataOnly > > 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. > Has anyone carried out an operation similar to this? > > I guess the documentation here is quite clear: > > https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20(GPFS)/page/NSD%20server%20balance > <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> > “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.” > -- The information contained in this communication and any attachments is > confidential and may be privileged, and is for the sole use of the intended > recipient(s). Any unauthorized review, use, disclosure or distribution is > prohibited. Unless explicitly stated otherwise in the body of this > communication or the attachment thereto (if any), the information is > provided on an AS-IS basis without any express or implied warranties or > liabilities. To the extent you are relying on this information, you are > doing so at your own risk. If you are not the intended recipient, please > notify the sender immediately by replying to this message and destroy all > copies of this message and any attachments. Neither the sender nor the > company/group of companies he or she represents shall be liable for the > proper and complete transmission of the information contained in this > communication, or for any delay in its receipt. > _______________________________________________ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org > > https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgpfsug.org%2Fmailman%2Flistinfo%2Fgpfsug-discuss&data=02%7C01%7CKevin.Buterbaugh%40vanderbilt.edu%7Cf2ffa137afda4368e32708d59a5c513c%7Cba5a7f39e3be4ab3b45067fa80faecad%7C0%7C1%7C636584643653030858&sdata=Wqpqck%2FuCuzJnolVxElWG6Eky5R%2Bsc4tyvEp6we85Sw%3D&reserved=0 > > > _______________________________________________ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org > http://gpfsug.org/mailman/listinfo/gpfsug-discuss >
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