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I am currently using ZFS and need to set a quota on the logical disk space (logicalused) rather than the physical disk space used after compression. The quota and refquota properties in ZFS set a limit based on the physical space, not on the logical space.

For example, I have dataset with quota and refquota set to 120M. When I try to fill it with the files, I get result:

# zfs list -o name,quota,used,logicalused,compressratio,referenced,logicalreferenced storage/datatest
NAME                      QUOTA   USED  LUSED  RATIO     REFER  LREFER
storage/datatest           120M   120M   147M  1.68x      120M    147M

But I want to get something like that:

NAME                      QUOTA   USED  LUSED  RATIO     REFER  LREFER
storage/datatest           120M    XXX   120M  1.68x       XXX    120M

Is there a way to set a quota in ZFS that limits the amount of logical space used, i.e. the space used before any compression or deduplication?

Thank you in advance for any insights or suggestions!

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    Interesting use case. ZFS does not have a mechanism for this. However, can you help explain why you need the physical space quota?
    – ewwhite
    Commented Jul 10 at 12:36
  • @ewwhite, I need logical disk space quota rather than the physical disk space quota. This is for users' home directories, each of them must have given logical space. Don't ask me why, I don't know myself: my boss told me to redo it this way from the physical quota.
    – Ivan Olshansky
    Commented Jul 10 at 13:11
  • @IvanOlshansky I need logical disk space quota rather than the physical disk space quota. Offhand, I don't know of any filesystem that implements that unless you want to spend large amounts of money for something like a Netapp server. And even then you might not get it - IBM's top-end GPFS doesn't support it, for example.
    – Andrew Henle
    Commented Jul 11 at 19:06
  • @AndrewHenle, It seems to me that it would not be too difficult to implement such an option in ZFS (although, of course, I may be mistaken). It is sad if it is not implemented.
    – Ivan Olshansky
    Commented Jul 11 at 22:08

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