Managing ZFS File Systems in Oracle® Solaris 11.2

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Updated: December 2014

Storage Pool Practices for Performance

  • Keep pool capacity below 90% for best performance

  • Mirrored pools are recommended over RAID-Z pools for random read/write workloads

  • Separate log devices

    • Recommended to improve synchronous write performance

    • With a high synchronous write load, prevents fragmentation of writing many log blocks in the main pool

  • Separate cache devices are recommended to improve read performance

  • Scrub/resilver - A very large RAID-Z pool with lots of devices will have longer scrub and resilver times

  • Pool performance is slow – Use the zpool status command to rule out any hardware problems that are causing pool performance problems. If no problems show up in the zpool status command, use the fmdump command to display hardware faults or use the fmdump –eV command to review any hardware errors that have not yet resulted in a reported fault.