Sounds like the typical configuration is just RocksDB on the
SSD, and both data and WAL on the OSD disk?
Not quite, WAL will be on the fastest available device. If you have
NVMe, SSD and HDD, your command should look something like this:
ceph-volume lvm create --bluestore --data /dev/$HDD --block.db
/dev/$SSD --block.wal /dev/$NVMe
If you only have HDD and SSD, both block.db and block.wal will be
placed on the SSD, assuming you provided the --block.db option. Some
more information can be found in [1].
Eugen
[1] http://docs.ceph.com/docs/master/rados/configuration/bluestore-config-ref/
Zitat von Robert Stanford <rstanford8896@xxxxxxxxx>:
Thank you. Sounds like the typical configuration is just RocksDB on the
SSD, and both data and WAL on the OSD disk?
On Thu, Jul 19, 2018 at 9:00 AM, Eugen Block <eblock@xxxxxx> wrote:
Hi,
if you have SSDs for RocksDB, you should provide that in the command
(--block.db $DEV), otherwise Ceph will use the one provided disk for all
data and RocksDB/WAL.
Before you create that OSD you probably should check out the help page for
that command, maybe there are more options you should be aware of, e.g. a
separate WAL on NVMe.
Regards,
Eugen
Zitat von Robert Stanford <rstanford8896@xxxxxxxxx>:
I am following the steps here:
http://docs.ceph.com/docs/mimic/rados/operations/bluestore-migration/
The final step is:
ceph-volume lvm create --bluestore --data $DEVICE --osd-id $ID
I notice this command doesn't specify a device to use as the journal. Is
it implied that BlueStore will use the same (OSD) device for the function?
I don't think that's what I want (I have spinning disks for data, and SSDs
for journals). Is there any reason *not* to specify which device to use
for a journal, when creating an OSD with BlueStore capability?
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