Difference between revisions of "System Administration"

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==== Whole disk tweaks ====
==== Whole disk tweaks ====


ZFS will also attempt minor tweaks on various platforms when whole disks are provided. On Illumos, ZFS will enable the disk cache for performance. It will not do this when given partitions to protect other filesystems sharing the disks that might not be tolerant of the disk cache, such as UFS. On Linux, the IO elevator will be set to noop to reduce CPU overhead. ZFS has its own internal IO elevator, which renders the Linux elevator redundant.
ZFS will also attempt minor tweaks on various platforms when whole disks are provided. On Illumos, ZFS will enable the disk cache for performance. It will not do this when given partitions to protect other filesystems sharing the disks that might not be tolerant of the disk cache, such as UFS. On Linux, the IO elevator will be set to noop to reduce CPU overhead. ZFS has its own internal IO elevator, which renders the Linux elevator redundant. The performance tuning page's [[http://open-zfs.org/wiki/Performance_tuning#Whole_Disks_versus_Partitions|Whole Disk versus Partitions]] section explains this behavior in more detail.


==== Drive error recovery control ====
==== Drive error recovery control ====
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