Re: BlueStore wal vs. db size

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On 08/15/2018 05:57 PM, Robert Stanford wrote:
> 
>  Thank you Wido.  I don't want to make any assumptions so let me verify,
> that's 10GB of DB per 1TB storage on that OSD alone, right?  So if I
> have 4 OSDs sharing the same SSD journal, each 1TB, there are 4 10 GB DB
> partitions for each?
> 

Yes, that is correct.

Each OSD needs 10GB/1TB of storage of DB. So size your SSD according to
your storage needs.

However, it depends on the workload if you need to offload WAL+DB to a
SSD. What is the workload?

Wido

> On Wed, Aug 15, 2018 at 1:59 AM, Wido den Hollander <wido@xxxxxxxx
> <mailto:wido@xxxxxxxx>> wrote:
> 
> 
> 
>     On 08/15/2018 04:17 AM, Robert Stanford wrote:
>     > I am keeping the wal and db for a ceph cluster on an SSD.  I am using
>     > the masif_bluestore_block_db_size / masif_bluestore_block_wal_size
>     > parameters in ceph.conf to specify how big they should be.  Should these
>     > values be the same, or should one be much larger than the other?
>     > 
> 
>     This has been answered multiple times on this mailinglist in the last
>     months, a bit of searching would have helped.
> 
>     Nevertheless, 1GB for the WAL is sufficient and then allocate about 10GB
>     of DB per TB of storage. That should be enough in most use cases.
> 
>     Now, if you can spare more DB space, do so!
> 
>     Wido
> 
>     >  R
>     >
>     >
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> 
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