On Fri, Sep 7, 2018 at 8:27 AM, Muhammad Junaid <junaid.fsd.pk@xxxxxxxxx> 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@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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