ZFS space consumption
nutsbastogne at gmail.com
Mon May 27 13:20:52 UTC 2019
Thanks for your answer.
The compressratio and refcompressratio are :
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 à 13:47, Stefan Esser <se at freebsd.org> a écrit :
> 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
> > 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 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
> > 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 ?
> > _______________________________________________
> > freebsd-fs at freebsd.org mailing list
> > https://lists.freebsd.org/mailman/listinfo/freebsd-fs
> > To unsubscribe, send any mail to "freebsd-fs-unsubscribe at freebsd.org"
More information about the freebsd-fs