![openzfs debian openzfs debian](https://grigio.org/content/images/2016/05/Screenshot-from-2016-05-16-09-47-02.png)
Here is a suggestion that you could use and tune for your system. I need some details about your system (disk information for the ZFS pool, system memory and CPU). That is too low, hence could lead to bad read performance. On your tests, I've observed that maximum number of active threads for asynchronous operations were set to 1.
![openzfs debian openzfs debian](https://dockerfile.run/og/1200x628/cmd/pymappergui.png)
Use a SLOG (Secondary Log) in really fast and separate devices, like SSD disks (NVMe is ideal, SATA is acceptable).Administrators should only use this option when the risks are understood.īear in mind that disabling sync could lead to data corruption. However, it is very dangerous as ZFS would be ignoring the synchronous transaction demands of applications such as databases or NFS. This option will give the highest performance. Setting up ZFS ARC size on Ubuntu as per our needs Set Max ARC size > 2GB 2147483648 Bytes options zfs zfsarcmax2147483648 Set Min ARC size > 1GB. File system transactions are only committed to stable storage periodically. Create a new file called zfs.conf as follows using a text editor such as vim command or nano command. From zfs manpage: disabled disables synchronous requests.You can get better performance if synchronous requests are disabled: zfs set sync=disabled tank/nfs_share. Options zfs_vdev_sync_read_max_active=128 (also 1 tested) Zfs-mod-tune: options zfs zfs_prefetch_disable=1 Sync=default zfs set compression=off zfs-pool nfs local_lock=all,vers=3,rw,user,intr,retry=1,async,nodev,auto,nosuid,noexec,retrans=1,noatime,nodiratime The reads stayed at 20 MB/s per device, yet.Īny ideas what to test? I'm new to zfs and NFS. After some Tuning (i think it was NFS with async) i got the writes to ~80 MB/s. When I copy data on the host there is no performance problem.īUT: the performance via NFS is exorbitant slow in the beginning for both write and read with 10 and 40 MB/s. I decided to use NFSv3 for the VM to handle user data.īecause of slow performance of BTRFS after maintance-tasks i use now zfs Raid1 Version: buster-backports 0.8.3-1 on the Debian Host. Because of my unanswered question : qemu snapshot exclude device