ZFS space consumption
Nuts Bastogne
nutsbastogne at gmail.com
Mon May 27 09:56:10 UTC 2019
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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