<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8"> <META NAME="GENERATOR" CONTENT="GtkHTML/3.32.2"> </HEAD> <BODY> Tim, I'm interested if you sorted out the answer to your question from Richard's response? I've seen this situation as well and I'm curious for clear answer. Cheers, <TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%"> <TR> <TD> -- Scott LeFevre </TD> </TR> </TABLE> On Mon, 2014-05-12 at 16:41 -0400, Tim Brown wrote: <BLOCKQUOTE TYPE=CITE> <PRE> I have a question about ZFS usage and how to predictability allocate space. I have scoured the web trying to get a good answer, but have yet to find one. I am advertising 2TB datastores to our VMware cluster over fiber channel using comstar. I use this command to create the dataset. zfs create -V 2047g vmpool01/datastores/ds01 It all works great but some of my datasets are using far more that the 2047g(more than double in one case). Here are some examples: zfs list NAME USED AVAIL REFER MOUNTPOINT ... vmpool01 27.4T 20.7T 469K /vmpool01 vmpool01/datastores 27.4T 20.7T 384K /vmpool01/datastores vmpool01/datastores/ds01 3.10T 20.7T 3.10T - vmpool01/datastores/ds02 2.06T 21.4T 1.34T - vmpool01/datastores/ds03 2.69T 20.7T 2.69T - vmpool01/datastores/ds04 2.49T 20.7T 2.49T - vmpool01/datastores/ds05 3.69T 20.7T 3.69T - vmpool01/datastores/ds06 4.67T 20.7T 4.67T - vmpool01/datastores/ds07 2.47T 20.7T 2.47T - vmpool01/datastores/ds08 2.06T 20.8T 1.92T - ... Can someone explain this to me or is there a document somewhere that can tell me how to predict the usage? Thanks. - Tim </PRE> </BLOCKQUOTE> </BODY> </HTML>