Thanks Eugen for pointing it out. I reread this link. https://ceph.readthedocs.io/en/latest/rados/configuration/bluestore-config-r... It seems that, for the mix of HDD and SSD, I don't need to create WAL device, just primary on HDD and DB on SSD, and WAL will be using DB device cause it's faster. Is that correct? Tony
-----Original Message----- From: Eugen Block <eblock@nde.ag> Sent: Monday, August 24, 2020 1:19 AM To: ceph-users@ceph.io Subject: [ceph-users] Re: Add OSD with primary on HDD, WAL and DB on SSD
Hi,
if you shared your drivegroup config we might be able to help identify your issue. ;-)
The last example in [1] shows the "wal_devices" filter for splitting wal and db.
Regards, Eugen
[1] https://docs.ceph.com/docs/master/cephadm/drivegroups/#dedicated- wal-db
Zitat von Tony Liu <tonyliu0592@hotmail.com>:
Hi,
I am able to add OSD with primary on HDD, WAL and DB on SSD on dashboard. LVs are created on SSD for OSDs. How can I achieve the same by CLI?
I tried with drivegroups, which adds OSD, but not WAL and DB. Should I handle LV for WAL and DB separately? Anything I am missing here?
Thanks!
Tony
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