On 21.03.2016 08:00, Fred Liu wrote:
So that means illumos can handle 512n and 4kn automatically and properly?
Not necessarily as far as I know. Sometime drives are emulating 512 blocks and don't properly tell the OS about that and Illumos ZFS is aligning the drives with ashift=9 which leads to enormous performance issues. Also forcing the system to handle drives with a specific sector size with the sd.conf doesn't turn out to be reliable in some cases (at least on my workstations). Here's what I do to ensure ashift=12 values:
Reboot the system with a Linux live disk of your choice and install ZoL in the live session. Then create the ZFS pool, export it and reboot the machine. OmniOS / Illumos can import the new pool without problems and the ashift value is correctly set. There was a fixed zpool binary (Solaris 11 binary) flying around the internet which can handle the "-o shift=12" parameter and works with OmniOS but unfortunately I can't find it again right now. This would make the reboot into a live session obsolete.
Does anyone know if the "ashift" parameter will be implemented in the OmniOS / Illumos zpool binary in the near future?
Best regards Hanno _______________________________________________ OmniOS-discuss mailing list OmniOS-discuss@lists.omniti.com http://lists.omniti.com/mailman/listinfo/omnios-discuss
