10:37 p.m.
Hi Folks,
We are thinking about throwing together some cephfs io500 results for
ISC20 and I just wanted to make sure that we are doing the right thing
in a couple of cases. Any help would be much appreciated since we've
never submitted results before. We might have a couple of additional
questions later on, but for now:
1) "All create/write phases must run for at least 300 seconds; the
stonewall flag must be set to 300 which should ensure this."
Is it acceptable to set the stonewall higher than 300, or is a setting
of exactly 300 required?
2) "The file names for the mdtest output files may not be pre-created."
Does this also include the directories? We have the ability to pin
directories to specific MDSes that helps in the easy tests. We also have
an experimental feature that more or less does this psuedo-randomly
behind the scenes so long as a top level xattr is set, but it would be
convenient if we could just pre-create the mdtest directories and set
the xattr to pin them individually in the "directory setup" phase of the
test if allowed. Likewise, we have code that allows users to provide a
hint if a specific directory is expected to have lots of files which can
improve performance in the hard tests. I would like to pre-create the
mdtest directory so that we can set the xattr informing ceph that we
expect a lot of files to be written in that directory.
3) "Only submissions using at least 10 physical client nodes are
eligible to win IO500 awards and at least one benchmark process must run
on each."
We are planning on running on AWS. So long as we are using 10+ metal
nodes does that meet the requirement to have "at least 10 physical
client nodes"?
Thanks,
Mark