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I don't think CoW can be disabled on ZFS... which is fine because VMs and databases pretty well with ZFS, even with CoW (a block size adjustment might be needed
by wizeman 6y ago
I don't think CoW can be disabled on ZFS... which is fine because VMs and databases pretty well with ZFS, even with CoW (a block size adjustment might be needed, though).
- nix23 6y agoYes true, but with Databases you should change the recordsize to 8 or 16k (Mysql or Postgres) and tune full_page_writes in postgres to off (zfs takes care of that), and just cache the metadata because the postgres-cache is better informed of what to cache.
- curt15 6y agoHow does ZFS avoid the performance pitfalls of btrfs's CoW implementation for VMs and databases?