[oi-dev] Improving file transfer speed on ZFS

[Atiq Rahman]

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
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