Beginners ceph journal question

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Hello Cephers 

Beginners question on Ceph Journals creation. Need answers from experts.

- Is it true that by default ceph-deploy creates journal on dedicated partition and data on another partition. It does not creates journal on file ??

ceph-deploy osd create ceph-node1:/dev/sdb

This commands is creating
data partition : /dev/sdb2
Journal Partition : /dev/sdb1

In ceph-deploy command i have not specified journal partition but still it creates a journal on sdb1 ? 

- How can i confirm if journal is on block device partition or on file ?

- How can i create journal on a file ? command would be helpful ?

Regards
Vicky
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