Hi all,
A couple of folks have asked me how to setup bluestore clusters for
performance testing. I personally am using cbt for this, but you should
be able to use ceph-disk with some other cluster creation method as well.
For CBT, you really don't need to do much. In the old newstore days, a
"block" symlink needed to be created in the osd data dir to link to the
new block device. CBT did this when the "newstore_block: True" option
was set in the cluster section of the cbt yaml file. This isn't really
needed anymore, as you can now specify the block, db, and wal devices
directly in your ceph.conf file. If your partitions are setup properly
you can create bluestore clusters without having to do anything beyond
changing the ceph.conf file (with cbt at least).
Here's a very basic example:
[global]
enable experimental unrecoverable data corrupting features =
bluestore rocksdb
osd objectstore = bluestore
[osd.0]
host = incerta01.front.sepia.ceph.com
osd data = /tmp/cbt/mnt/osd-device-0-data
bluestore block path = /dev/disk/by-partlabel/osd-device-0-block
bluestore block db path = /dev/disk/by-partlabel/osd-device-0-db
bluestore block wal path = /dev/disk/by-partlabel/osd-device-0-wal
Here we enable the experimental bluestore and rocksdb features, set the
objectstore to bluestore, and then in the OSD sections manually set the
osd data, bluestore block, bluestore block db, and bluestore block wal
paths. You might be wondering what all of these are for:
osd data <-- very small directory on FS for bootstrapping OSD.
bluestore block <-- where the actual object data lives
bluestore block db path <-- where rocksdb lives
bluestore block wal path <-- where rocksdb writeahead log lives
And that's basically it. I've uploaded an example partitioning script,
ceph.conf file, and cbt yaml configuration file based on actual tests
I'm running to the examples folder that I've actually been using for
testing here:
https://github.com/ceph/cbt/tree/master/example/bluestore
Thanks,
Mark
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