> On 4. Nov 2025, at 09:06, Stephan Althaus via oi-dev <[email protected]> > wrote: > > On 11/4/25 05:03, Atiq Rahman 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. >> >> 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? >> >> >> Best! <> >> Atiq <> >> >> _______________________________________________ >> oi-dev mailing list >> [email protected] <mailto:[email protected]> >> https://openindiana.org/mailman/listinfo/oi-dev > Hello Atiq! > > How do you copy, please show the commands (?) > > You may want to investigate the read speed with something like zfs send ... > > /dev/null > > If you do a zfs send -> receive, a buffer like "mbuffer" may help, over > network pathes in combination with a compression pbzip2, pigz ... > > > > Regards, > > Stephan > If its external HDD, which interface? usb3?
rgds, toomas
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