On 24/05/2017 22:10, Ken Merry wrote:
Is anyone working on SMR support for ZFS?
I put support into FreeBSD for SMR drives from the block layer (GEOM)
through the SCSI layer (CAM):
https://svnweb.freebsd.org/base?view=revision&revision=300207
So far, no filesystems in the FreeBSD tree are using the SMR support.
It looks like there are Linux folks working on SMR support:
http://events.linuxfoundation.org/sites/events/files/slides/lemoal-Linux-SMR-vault-2017.pdf
We (Spectra Logic) are considering starting work on supporting Host
Aware and Host Managed SMR drives in ZFS, and we’d rather collaborate
with other folks who are interested instead of duplicating the effort.
There was a discussion about it at the European OpenZFS conference in
Paris a couple of years ago. One of the drive vendors came along and
gave a technical presentation on SMR, with a view to persuading ZFS
developers to modify ZFS to make good use of SMR drives.
The presentation was very good, but the general feedback at the time was
that no one believed SMR would be around for very long, probably not
long enough to get any support in ZFS stable, before hard drives had
completely given way to SSDs.
Things may have changed since then, although I hear less about SMR
drives now than I did back then. How long do you think SMR will be
around? What is your use case for the drives?
--
Andrew
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