On Wed, Aug 15, 2018 at 10:58 AM, Wido den Hollander <wido@xxxxxxxx> wrote:
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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> > ceph-users mailing list
com >
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> >
>
>
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