24 Apr
2018
24 Apr
'18
12:22 p.m.
On Mon, 23 Apr 2018 22:59:19 -0600 Warner Losh <imp(a)bsdimp.com> wrote:
Ah. Thanks! Does host management of SMR zones provide better
throughput for sequential writes? Enough to make it worht it?
[I guess this may be something you guys may care about?]
Haven't had a chance to work on storage stuff for ages. [Last
I played with Ceph was 5 years ago and at a higher level than
disks.]
...
Not_Zoned # Zone Mode <<== this seems wrong.
That's right. This is for BIO_ZONE stuff, which has to do with host managed
and host aware SMR drive zones. That's different than the zones you are
talking about. Yes. This matches our experience where we get 1.5x
better on the low LBAs
than the high LBAs. We're looking to 'short stroke' the drive to the
first
part of it to get better performance... Toss a filesystem on top of it, and
have a more random workload and it's down to about 30% better than using
the whole drive....
Is the tradeoff worth it? Now you have choices like Sata vs
SAS vs SDD vs PCIe....
We've come a long way from /dev/drum :-)