On Tue, Nov 4, 2025 at 4:03 AM Atiq Rahman <[email protected]> wrote:
> Hi, > When I am copying over files to the zfs dataset on an external HDD, the > speed is one third of what it is over exFAT. This is zfs to zfs copy which > is basically way slower than zfs to exFAT. > What speed are you actually getting? Both from the perspective of how long the copy takes, but also from iostat. I do this, and see transfer speeds that are either limited by the capacity of USB2, or the drive itself if I have a USB3 port. > This was my zpool create command on the external drive, > > ``` > zpool create -o ashift=12 -O compression=lz4 -o autotrim=off -O > mountpoint=none -O atime=off -O dnodesize=auto hyperspace /dev/dsk/c4t0d0 > ``` > > And, this is how the dataset was created: > > ``` > zfs create -o recordsize=1M -o normalization=formD -O mountpoint=/media > hyperspace/media > ``` > > I know zfs has journaling overhead. But, is it possible to set certain zfs > properties to improve the transfer speed? > Journaling normally speeds things up. But generally I would start with using the defaults (except compression), other settings generally only come into play in specialist cases. > > Best! > > Atiq > > *illumos <https://illumos.topicbox.com/latest>* / illumos-developer / see > discussions <https://illumos.topicbox.com/groups/developer> + participants > <https://illumos.topicbox.com/groups/developer/members> + delivery options > <https://illumos.topicbox.com/groups/developer/subscription> Permalink > <https://illumos.topicbox.com/groups/developer/T3563e6ee3701c6ac-Ma4903f0f3c68cdbe99c7f9ec> > -- -Peter Tribble http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/
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