Adding Steve and Wes to provide guidance on ESS commands. Regards, The Spectrum Scale (GPFS) team ------------------------------------------------------------------------------------------------------------------ If you feel that your question can benefit other users of Spectrum Scale (GPFS), then please post it to the public IBM developerWroks Forum at https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479. If your query concerns a potential software error in Spectrum Scale (GPFS) and you have an IBM software maintenance contract please contact 1-800-237-5511 in the United States or your local IBM Service Center in other countries. The forum is informally monitored as time permits and should not be used for priority messages to the Spectrum Scale (GPFS) team. From: "Peter Childs" <[email protected]> To: "[email protected]" <[email protected]> Date: 22-06-2022 03.36 PM Subject: Re: [gpfsug-discuss] [EXTERNAL] How to shrink GPFS on DSSG's? Sent by: "gpfsug-discuss" <[email protected]> Having only just got an ESS I'm still learning how GNR works. as I read it there are currently two "breeds" of GNR, the version on the "DSS and ESS appliances" and the one in "Erasure Code Edition" As I understand it from past talks using mmdeldisk to remove a disk works fine in none GNR editions but is not the best way to do the task. My understanding is that you should mmchdisk suspend/empty # so new data is not put on the disk but the disk remains available for read. mmrestripefs -m # to move the data off the disk mmdeldisk # to actually remove the disk which should be fast as its already been emptied. We have done this with success in the past to migrate data between Raid6 arrays, with success. I believe there are some commands with mmvdisk to re-shape recovery groups in GNR but I've not as yet worked out how they work. Peter Childs ________________________________________ From: gpfsug-discuss <[email protected]> on behalf of Jaime Pinto <[email protected]> Sent: Monday, June 20, 2022 7:04 PM To: [email protected] Subject: [EXTERNAL] [gpfsug-discuss] How to shrink GPFS on DSSG's? CAUTION: This email originated from outside of QMUL. Do not click links or open attachments unless you recognise the sender and know the content is safe. I'm wondering if it's possible to shrink GPFS gracefully. I've seen some references to that effect on some presentations, however I can't find detailed instructions on any formal IBM documentation on how to do it. About 3 years ago we launched a new GPFS deployment with 3 DSS-G enclosures (9.6PB usable). Some 1.5 years later we added 2 more enclosures, for a total of 16PB, and only 7PB occupancy so far. Basically I'd like to return to the original 3 enclosures, and still maintain the (8+2p) parity level. Any suggestions? Thanks Jaime --- Jaime Pinto - Storage Analyst SciNet HPC Consortium - www.scinet.utoronto.ca University of Toronto _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at gpfsug.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at gpfsug.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss_gpfsug.org
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