Bluestore_block_db_size
Bluestore_block_wal_size
If you have an SSD you should give as much space as you can to the DB and don't care about the Wal (Wal would always be placed in the fastest device)
I am not sure about hot moving the DB but as far as you have replicas you can always remake the osd.
If SSD breaks and it's not possible to recover the data all your OSDs will break but as far as you have a replicas in other node you can remake the OSDs and they will rebalance.
That's why you shouldn't use consumers SSD for rocksDB.
-------- Mensaje original --------
De: Mario Giammarco <mgiammarco@xxxxxxxxx>
Fecha: 14/10/17 10:54 AM (GMT+01:00)
Para: ceph-users <ceph-users@xxxxxxxxxxxxxx>
Asunto: Re: [ceph-users] Questions about bluestore
Nobody can help me?
Il ven 6 ott 2017, 07:31 Mario Giammarco <mgiammarco@xxxxxxxxx> ha scritto:
Hello,I am trying Ceph luminous with Bluestore.I create an osd:ceph-disk prepare --bluestore /dev/sdg --block.db /dev/sdfand I see that on ssd it creates a partition of only 1g for block.dbSo:ceph-disk prepare --bluestore /dev/sdg --block.wal /dev/sdf --block.db /dev/sdf
and again it creates two partitions, 1g and 500mbIt seems to me that they are too small the ssd is underutilized (docs says you need a ssd greater than 1g to put a block.db on)Other two questions:- if I already have an osd bluestore can I move later the db on ssd?- docs says that I can add several block.db of different osds on one ssd. But what happens if ssd breaks?Thanks,Mario
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