Date: Mon, 27 May 2019 15:20:39 +0200 From: Nuts Bastogne <nutsbastogne@gmail.com> To: Stefan Esser <se@freebsd.org>, freebsd-fs@freebsd.org Subject: Re: ZFS space consumption Message-ID: <CAKrR4rDDUttqAp68GSzXFt32TOiNR6U5w_%2B-E=K9TbvMLTpGxA@mail.gmail.com> In-Reply-To: <f450c4ee-6ddc-1da3-3507-c9ca30f4366e@freebsd.org> References: <CAKrR4rACE2dHxJrKAXmzPz8teGZGncSPDOuXPA1TFMz689vqhw@mail.gmail.com> <f450c4ee-6ddc-1da3-3507-c9ca30f4366e@freebsd.org>
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Hi Stefan, Thanks for your answer. The compressratio and refcompressratio are : compressratio 1.05x refcompressratio 1.07x Maybe i'm wrong but i don't think this ii related to my "issue" and if i understand well, the compression should decreased the space used property not the logicalused property. Le lun. 27 mai 2019 =C3=A0 13:47, Stefan Esser <se@freebsd.org> a =C3=A9cri= t : > Am 27.05.19 um 11:55 schrieb Nuts Bastogne: > > 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 > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Might that be the answer? > > Look at the current compression ratio ... > > > usedbydataset 483G > > written 483G > > logicalused 238G > > logicalreferenced 251G > > > > logicalused and logicalreferenced are correct, so the vm didnt see a di= sk > > 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 =3D 16k > > ashift =3D 12 > > > > What i can check to go deeper on this issue ? > > or this is just a normal behavior du to my configuration ? > > _______________________________________________ > > freebsd-fs@freebsd.org mailing list > > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > > > >
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