Date: Mon, 27 May 2019 11:55:56 +0200 From: Nuts Bastogne <nutsbastogne@gmail.com> To: freebsd-fs@freebsd.org Subject: ZFS space consumption Message-ID: <CAKrR4rACE2dHxJrKAXmzPz8teGZGncSPDOuXPA1TFMz689vqhw@mail.gmail.com>
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Hi All, I'm confused about the zfs consumption of space. I'm using ZFS to create clone from a sysprep and use it as a zvol for vm connected via iscsi. The zvol has a size of 256GB. But several dataset have a space comsuption bigger than the size of the zvol. I thought this could be happen when we use snapshot but this is not my case. here information from one zvol impacted : type volume volsize 256G used 483G referenced 507G copies 1 refreservation none compression lz4 usedbydataset 483G written 483G logicalused 238G logicalreferenced 251G logicalused and logicalreferenced are correct, so the vm didnt see a disk bigger than 256GB. As used, usedbydataset, referenced properties don't include metadata neither snapshot i dont'know what it could be. After some research on the web some people had the same issue du to the blocksize of their disk and had to change the ashift to 12. but this is our configuration already. disk : (from diskinfo -v) SSD 512 # sectorsize 3840755982336 # mediasize in bytes (3.5T) 7501476528 # mediasize in sectors 4096 # stripesize volblocksize = 16k ashift = 12 What i can check to go deeper on this issue ? or this is just a normal behavior du to my configuration ?
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