UNMAP

Help, my Thin Provisioning is not working

Leave a Comment / Config Guide, Troubleshooting /

On many occasions I\’ve seen posts from storage administrator who mapped some luns to hosts and on the first use the entire pool got whacked with all bells and whistles going off. (Yes, we can control bells and whistles.:-)) The administrator did nothing wrong however he should have communicated with the server admin what the […]

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SCSI UNMAP and performance implications

5 Comments / Config Guide, Storage Networking, Troubleshooting /

When listening to Greg Knieriemens\’ podcast on Nekkid Tech there was some debate on VMWare\’s decisision to disable the SCSI UNMAP command on vSphere 5.something. Chris Evans (www.thestoragearchitect.com) had some questions why this has happened so I\’ll try to give a short description. Be aware that, although I work for Hitachi, I have no insight

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