There is a thread from the ceph-large users ML that covered a way to do this change without shifting data for an HDD only cluster. Hopefully it will be helpful for you.
httpists.ceph.com/pipermail/ceph-large-ceph.com/2018-April/000106.html
On Mon, Aug 20, 2018, 5:42 AM Enrico Kern <enrico.kern@xxxxxxxxxx> wrote:
Hmm then is not really an option for me. Maybe someone from the devs can shed a light why it is doing migration as long you only have OSDs with the same class? I have a few Petabyte of Storage in each cluster. When it starts migrating everything again that will result in a super big performance bottleneck. My plan was to set the existing pools to use the new crush rule hdd only and add ssd osds later.On Mon, Aug 20, 2018 at 11:22 AM Marc Roos <M.Roos@xxxxxxxxxxxxxxxxx> wrote:
I just recently did the same. Take into account that everything starts
migrating. How weird it maybe, I had hdd test cluster only and changed
the crush rule to having hdd. Took a few days, totally unnecessary as
far as I am concerned.
-----Original Message-----
From: Enrico Kern [mailto:enrico.kern@xxxxxxxxxx]
Sent: maandag 20 augustus 2018 11:18
To: ceph-users@xxxxxxxxxxxxxx
Subject: Set existing pools to use hdd device class only
Hello,
right now we have multiple HDD only clusters with ether filestore
journals on SSDs or on newer installations WAL etc. on SSD.
I plan to extend our ceph clusters with SSDs to provide ssd only pools.
In luminous we have devices classes so that i should be able todo this
without editing around crush map.
In the device class doc it says i can create "new" pools to use only
ssds as example:
ceph osd crush rule create-replicated fast default host ssd
what happens if i fire this on an existing pool but with hdd device
class? I wasnt able to test thi yet in our staging cluster and wanted to
ask whats the way todo this.
I want to set an existing pool called volumes to only use osds with hdd
class. Right now all OSDs have hdds. So in theory it should not use
newly created SSD osds once i set them all up for hdd classes right?
So for existing pool running:
ceph osd crush rule create-replicated volume-hdd-only volumes default
hdd ceph osd pool set volumes crush_rule volume-hdd-only
should be the way to go right?
Regards,
Enrico
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Enrico Kern
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Enrico Kern_______________________________________________
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Managing Director Din Karol-Gavish
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