I've used thin provisioning on a HDS USP-V. When it was replaced with a HDS VSP, we used it again. On HDS enterprise arrays, you get a performance/tuning benefit as it stripes your data across many volumes. It has been a wonderful, horrible thing! It certainly helps raise device utilization a lot higher. Lots of time people ask for 1 TB and use 200 GB, Thin really helps with that. Bad thing, you never really know when you will 'run' out of space. Toward the end of lease or end of life of the array when space gets tight, you worry that someone will create a true out of space condition that will create all kinds of bad stuff like lots of databases shutting down at once since it can't write out log files. Seems like every 'new' virtualization idea brings good and bad to the table.
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