On 2018-09-07 14:36, Alfredo Deza wrote:
> On Fri, Sep 7, 2018 at 8:27 AM, Muhammad Junaid <junaid.fsd...@gmail.com>
> wrote:
>
>> Hi there
>>
>> Asking the questions as a newbie. May be asked a number of times before by
>> many but sorry, it is not clear yet to me.
>>
>> 1. The WAL device is just like journaling device used before bluestore. And
>> CEPH confirms Write to client after writing to it (Before actual write to
>> primary device)?
>>
>> 2. If we have lets say 5 OSD's (4 TB SAS) and 1 200GB SSD. Should we
>> partition SSD in 10 partitions? Shoud/Can we set WAL Partition Size against
>> each OSD as 10GB? Or what min/max we should set for WAL Partition? And can
>> we set remaining 150GB as (30GB * 5) for 5 db partitions for all OSD's?
>
> A WAL partition would only help if you have a device faster than the
> SSD where the block.db would go.
>
> We recently updated our sizing recommendations for block.db at least
> 4% of the size of block (also referenced as the data device):
>
> http://docs.ceph.com/docs/master/rados/configuration/bluestore-config-ref/#sizing
>
> In your case, what you want is to create 5 logical volumes from your
> 200GB at 40GB each, without a need for a WAL device.
>
>> Thanks in advance. Regards.
>>
>> Muhammad Junaid
>>
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users@lists.ceph.com
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> _______________________________________________
> ceph-users mailing list
> ceph-users@lists.ceph.com
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
should not the db size depend on the number of objects stored rather
than their storage size ? or is the new recommendation assuming some
average object size ?
_______________________________________________
ceph-users mailing list
ceph-users@lists.ceph.com
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
