Multiple cached tiers? 2 tiers to 1 pool or a cache tier to a cache tier? Neither are discussed or mentioned anywhere. At best it might work, but isn't tested for a new release.
The luminous docs for cache tiering was updated with "A Word of Caution" where they try to explain which use cases do and don't make sense for cache tiering. There are definitely some use cases that benefit from cache tiering, but most will benefit more from other osd stack tweaks.
To configure an MDS manually, I pieced the following together from around the net a couple months back and put this together from my history. It assumes that `hostname -s` is the name you plan to name the mds daemon, that you use systemd, runs the daemon in your window to watch it running and troubleshoot anything if you need to, and ultimately starting it as a service.
host=$(hostname -s)
mkdir -p /var/lib/ceph/mds/ceph-$host
ceph-authtool --create-keyring /var/lib/ceph/mds/ceph-$host/keyring --gen-key -n mds.$host
chmod 640 /var/lib/ceph/mds/ceph-$host/keyring
touch /var/lib/ceph/mds/ceph-$host/systemd
ceph auth add mds.$host osd "allow rwx" mds "allow" mon "allow profile mds" -i /var/lib/ceph/mds/ceph-$host/keyring
chown -R ceph:ceph /var/lib/ceph/mds/
ceph-mds -i $host --setuser ceph --setgroup ceph
# ctrl+c to exit the daemon so you can start it as a service
systemctl enable ceph-mds@$host.service
systemctl start ceph-mds@$host.service
On Mon, Oct 23, 2017 at 2:00 AM Jeff <jarvis@xxxxxxxxxx> wrote:
Hey everyone,
Long time listener first time caller.
Thank you to everyone who works on Ceph, docs and code, I'm loving Ceph.
I've been playing with Ceph for awhile and have a few Qs.
Ceph cache tiers, can you have multiple tiered caches?
Also with cache tiers, can you have one cache pool for multiple backing
storage pools? The docs seem to be very careful about specifying one
pool so I suspect I know the answer already.
For CephFS, how do you execute a manual install and manual removal for MDS?
The docs explain how to use ceph-deploy for MDS installs, but I'm trying
to do everything manually right now to get a better understanding of it
all.
The ceph docs seem to be version controlled but I can't seem to find the
repo to update, if you can point me to it I'd be happy to submit patches
to it.
Thnx in advance!
Jeff.
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