Thanks Alfredo. Just to clear that My configuration has 5 OSD's (7200 rpm SAS HDDS) which are slower than the 200G SSD. Thats why I asked for a 10G WAL partition for each OSD on the SSD.
Are you asking us to do 40GB * 5 partitions on SSD just for block.db? On Fri, Sep 7, 2018 at 5:36 PM Alfredo Deza <[email protected]> wrote: > On Fri, Sep 7, 2018 at 8:27 AM, Muhammad Junaid <[email protected]> > 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 > > [email protected] > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > >
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