On 2013-09-19 3:44 AM, Hinnerk van Bruinehsen <h.v.bruinehsen@fu-
You should definitely determine the right value for ashift on pool creation
(it controls the alignment on the medium). It's an option that you afaik can
only set
on filesystem creation and therefore needs a restart from scratch if you get it
wrong.
According to the illumos wiki it's possible to run a mixed pool (if you have
drives requiring different alignments[1])
If in doubt: ask ryao (iirc given the right information he can tell you which
are the right options for you if you can't deduce it yourself).
Choosing the wrong alignment can cause severe performance loss (that's not
a ZFS issue but happened when 4k sector drives appeared and tools like fdisk
weren't aware of this).
Yikes...
Ok, shouldn't there be a tool or tools to help with this? Ie, boot up on
a bootable tools disk on the system with all drives connected, then let
it 'analyze' your system, maybe ask you some questions (ie, how you will
be configuring the drives/RAID, etc), then spit out an optimized config
for you?
It is starting to sound like you need to be a dang engineer just to use
ZFS...
