[SOLVED] Ceph - how to create OSD with dedicated WAL device

[cmonty14]

Hello!

Based on the documentation I can create an OSD with a dedicated journal on SSD with this command:
pveceph createosd /dev/sd[X] -journal_dev /dev/sd[X]

Question:
How can I create an OSD with a dedicated WAL device as documented here?

THX

 

[dcsapak]

pveceph createosd [...] --wal_dev XYZ

see 'man pveceph'

 

[alexskysilk]

Is there an option to specify wal or blockdb partition size?

 

[dcsapak]

Is there an option to specify wal or blockdb partition size?

sure, but you have to set the size in the ceph conf before creating an osd

from http://docs.ceph.com/docs/master/rados/configuration/bluestore-config-ref/?highlight=block wal size (sadly there is no better documentation for this)

bluestore_block_db_size = SIZE_IN_BYTES
bluestore_block_wal_size = SIZE_IN_BYTES