On 2017-09-21 07:56, Lazuardi Nasution wrote:
> Hi,
>
> I'm still looking for the answer of these questions. Maybe someone can share
> their thought on these. Any comment will be helpful too.
>
> Best regards,
>
> On Sat, Sep 16, 2017 at 1:39 AM, Lazuardi Nasution <mrxlazuar...@gmail.com>
> wrote:
>
>> Hi,
>>
>> 1. Is it possible configure use osd_data not as small partition on OSD but a
>> folder (ex. on root disk)? If yes, how to do that with ceph-disk and any
>> pros/cons of doing that?
>> 2. Is WAL & DB size calculated based on OSD size or expected throughput like
>> on journal device of filestore? If no, what is the default value and
>> pro/cons of adjusting that?
>> 3. Is partition alignment matter on Bluestore, including WAL & DB if using
>> separate device for them?
>>
>> Best regards,
>
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I am also looking for recommendations on wal/db partition sizes. Some
hints:
ceph-disk defaults used in case it does not find
bluestore_block_wal_size or bluestore_block_db_size in config file:
wal = 512MB
db = if bluestore_block_size (data size) is in config file it uses 1/100
of it else it uses 1G.
There is also a presentation by Sage back in March, see page 16:
https://www.slideshare.net/sageweil1/bluestore-a-new-storage-backend-for-ceph-one-year-in
wal: 512 MB
db: "a few" GB
the wal size is probably not debatable, it will be like a journal for
small block sizes which are constrained by iops hence 512 MB is more
than enough. Probably we will see more on the db size in the future.
Maged
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