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Asked: 2019-02-26 03:16:11 +0800 CST

How to change default zfs options of a zpool?

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How do I change the default options for zfs filesystems on an existing zpool?

That is, ZFS stored for each zpool pool the default values for new zfs filesystems. Those are then used by zfs create as default values if they aren't explicitly overwritten.

I know that zpool allows to set those default values on creation, by using the capital -O flag:

zpool create -O atime=off -O compression=on ...

That way, all filesystem creation commands can be shortened from:

zfs create -o atime=off -o compression=on ...

to:

zfs create ...

However, what if I didn't set the -O on zpool creation? How can I set or change them for an existing pool?

Update

The following command finally worked for me:

zfs set atime=off compression=on zroot

Thanks to @ewwhite and @shodanshok.

configuration

2 Answers

  1. Best Answer

    You can just use zpool get all to show available pool options and zpool set option= on the desired option.

    For filesystem options, you view/set them with zfs get and zfs set on either the top-level filesystem or individually on the sub-filesystems (who otherwise inherit the options from the top level).

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  2. Adding to the answer of @ewwhite, while most properties are propagated to child datasets on creation, so you may have to run it on each pre-created filesystem / zvol manually to make the whole pool have the same properties.

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