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1. Wikis Home
2. Performance
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4. Flash Storage Performance
5. Tuning ZFS for the F5100

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Tuning ZFS for the F5100

• Added by Lisa_N, last edited by Lisa_N on Nov 02, 2009  (view change)

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Home Page Main Performance Page Tuning ZFS for F5100 ZFS Tuning for the F5100 Solaris Procedure Additional Information Home Page Topics System Performance Open Storage Performance Flash Performance CMT Performance Network Performance Software Performance ZFS Performance Oracle Performance MySQL Performance Web Performance Other Software Performance Tools OpenSolaris Forums Performance Databases Observability ZFS DTrace Links Best Performance, Best Practices Solaris Internals Performance Wiki Performance Community Observability Community ZFS Community DTrace Community

Tuning ZFS for the F5100 Storage Array Solaris Procedure The following best practices are recommended in order to achieve optimal performance of ZFS on the F5100 storage array. Disable metadata compression by adding the following entry to /etc/system: set zfs:zfs_mdcomp_disable = 1 Disable cache flushing by adding the following entry to /etc/system. (The F5100 has built-in supercapacitors that provide enough power to ensure time to flush all device caches in the event of a power failure.) set zfs:zfs_nocacheflush = 1 Identify the device for the ZFS intent log Consider using a fast disk-based device for the ZFS intent log if one is available. If no such device is available, segment a separate pool of F5100 FMods and specify as the log device. Record Size Large performance gains can be realized by reducing the default recordsize used by ZFS, particularly when running database workloads. The ZFS recordsize should match the database recordsize. Note that the recordsize setting must be in place prior to when data is loaded on zfs. Additional reading on this subject may be found at http://blogs.sun.com/roch/entry/tuning_zfs_recordsize. The following example illustrates how to set the recordsize to 16k: zfs set recordsize=16k mypool/myfs Device IO Queue Size The following parameter should be set in the /etc/system file: set zfs:zfs_vdev_max_pending = 8 Additional Information Additional information and background may be found here: http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide.

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