Thinly provisioned (compressed) metadata volumes is unsupported according to IBM. See the GPFS FAQ here, question 4.12: "Placing GPFS metadata on an NSD backed by a thinly provisioned volume is dangerous and unsupported." http://www.ibm.com/support/knowledgecenter/en/STXKQY/gpfsclustersfaq.html Bob Oesterlin Sr Storage Engineer, Nuance HPC Grid 507-269-0413 From: <gpfsug-discuss-bounces at spectrumscale.org> on behalf of Brian Marshall <mimarsh2 at vt.edu> Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org> Date: Saturday, July 16, 2016 at 9:56 PM To: "gpfsug-discuss at spectrumscale.org" <gpfsug-discuss at spectrumscale.org> Subject: [EXTERNAL] [gpfsug-discuss] SSD LUN setup I have read about other products doing RAID1 with deduplication and compression to take less than the 50% capacity hit. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20160717/6e0bd775/attachment.html>