Re: read/write slow on nvme drive - Supermicro X10DRL-CT

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Thu, Aug 11, 2016 at 11:47:20AM -0400, D'Arcy J.M. Cain wrote:
> On Thu, 11 Aug 2016 11:06:15 -0400 (EDT)
> Derrick Lobo <derrick.lobo%givex.com@localhost> wrote:
> > No they are not setup as log file system
> > 
> > /dev/dk1        /data_local     ffs     rw               2 1
> > /dev/dk0        /mnt    ffs     rw               3 1
> > 
> > Dk0 is the the nvme drive
> > While dk1 is the ssd drive.. both are 2tb drives
> 
> Given the /mnt entry I assume that this is a test system so go ahead
> and change "rw" to "rw,log" and reboot.  May as well change both and
> test both.  Make sure that your kernel has "options WAPBL".  The
> GENERIC one does.

Why?  The writes to the SSD should be so fast that the overhead of
double-writing the metadata, synchronizing the cache, etc. should
considerably exceed any delay from synchronously writing the metadata
once...

I don't run with "log" on any of my SSD systems.

Thor