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Update _index.adoc with current zfs prefetch disable sysctl value #554

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Update _index.adoc with current zfs prefetch disable sysctl value #554

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2 changes: 1 addition & 1 deletion documentation/content/en/books/handbook/zfs/_index.adoc
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Expand Up @@ -2671,7 +2671,7 @@ Future disks use 4 KB sectors, and `ashift` values cannot change after creating
In some specific cases, the smaller 512-byte block size might be preferable.
When used with 512-byte disks for databases or as storage for virtual machines, less data transfers during small random reads.
This can provide better performance when using a smaller ZFS record size.
* [[zfs-advanced-tuning-prefetch_disable]] `_vfs.zfs.prefetch_disable_` -
* [[zfs-advanced-tuning-prefetch_disable]] `_vfs.zfs.prefetch.disable_` -
Disable prefetch. A value of `0` enables and `1` disables it. The default is
`0`, unless the system has less than 4 GB of RAM. Prefetch works by reading
larger blocks than requested into the crossref:zfs[zfs-term-arc,ARC] in hopes to soon need the data. If the workload has a large number of random reads, disabling prefetch may actually improve performance by reducing unnecessary reads. Adjust this value at any time with man:sysctl[8].
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