|
I'm also not 100% sure but I think that the first one is the
right way to go. The second command only specifies the db
partition but no dedicated WAL partition. The first one should do
the trick.
On 28.06.2018 22:58, Igor Fedotov
wrote:
I think the second variant is what you need. But I'm not the
guru in ceph-deploy so there might be some nuances there...
Anyway the general idea is to have just a single NVME partition
(for both WAL and DB) per OSD.
Thanks,
Igor
On 6/27/2018 11:28 PM, Pardhiv Karri
wrote:
Thank you Igor for the response.
So do I need to use this,
ceph-deploy osd create --debug --bluestore --data
/dev/sdb --block-wal /dev/nvme0n1p1 --block-db
/dev/nvme0n1p2 cephdatahost1
or
ceph-deploy osd create --debug --bluestore --data
/dev/sdb --block-db /dev/nvme0n1p2 cephdatahost1
where /dev/sdb is ssd disk for osd
/dev/nvmen0n1p1 is 10G partition
/dev/nvme0n1p2 is 25G partition
Thanks,
Pardhiv K
Hi Pardhiv,
there is no WalDB in Ceph.
It's WAL (Write Ahead Log) that is a way to ensure
write safety in RocksDB. In other words - that's just a
RocksDB subsystem which can use separate volume though.
In general For BlueStore/BlueFS one can either allocate
separate volumes for WAL and DB or have them on the same
volume. The latter is the common option.
The separated layout makes sense when you have tiny but
super-fast device (for WAL) and less effective (but
still fast) larger drive for DB. Not to mention the
third one for user data....
E.g. HDD (user data) + SDD (DB) + NVME (WAL) is such a
layout.
So for you case IMO it's optimal to have merged WAL+DB
at NVME and data at SSD. Hence no need for separate WAL
volume.
Regards,
Igor
On
6/26/2018 10:22 PM, Pardhiv Karri wrote:
Hi,
I am playing with Ceph Luminous and getting
confused information around usage of WalDB vs
RocksDB.
I have 2TB NVMe drive which I want to use for
Wal/Rocks DB and have 5 2TB SSD's for OSD.
I am planning to create 5 30GB partitions for
RocksDB on NVMe drive, do I need to create
partitions of WalDB also on NVMe drive or does
RocksDB does same work as WalDB plus having metadata
on it?
So my question is do I really need to use WalDB
along with RocksDB or having RocksDB only is fine?
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
--
Pardhiv Karri
"Rise and Rise again until LAMBS
become LIONS"
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
--
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
|
Attachment:
signature.asc
Description: OpenPGP digital signature
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
