> On Wed, Dec 16 at 7:35, Bill Sprouse wrote: > >The question behind the question is, given the > really bad things that > >can happen performance-wise with writes that are not > 4k aligned when > >using flash devices, is there any way to insure that > any and all > >writes from ZFS are 4k aligned? > > Some flash devices can handle this better than > others, often several > orders of magnitude better. Not all devices (as you > imply) are > so-affected.
As a specific example of 2 devices with dramatically different performance for sub-4k transfers has anyone done any ZFS benchmarks between the X25E and the F20 they can share? I am particularly interested in zvol performance with a blocksize of 16k and highly compressible data (~10x). I am going to run some comparison tests but would appreciate any initial input on what to look out for or how to tune ZFS to get the most out of the F20. It might be helpful, e.g., if there where some where in the software stack where I could tell part of the system to lie and treat the F20 as a 4k device? Thanks. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
