On Thu, Nov 1, 2018 at 12:46 AM Ashley Merrick <singap...@amerrick.co.uk> wrote: > > Hello, > > I have a small EC Pool I am using with RBD to store a bunch of large files > attached to some VM's for personal storage use. > > Currently I have the EC Meta Data Pool on some SSD's, I have noticed even > though the EC Pool has TB's of data in the metadata pool is only in the 2MB > Range. > > My question is would the EC performance benefit from the metadata being on > NVME (I am guessing the I/O is lots of tiny read's and writes), or is the > performance required for the metadata pool tiny and does not yield any real > benefit from different underlying storage (SATA/SSD/NVME)
The metadata that RBD stores on the replicated pool is, in general, not used during IO operations. Instead, it's key/value pairs that are used to define the layout and settings of the image. The object-map is also stored on the metadata pool, but in general the cost of updating the object map is amortized over multiple writes. > Thanks > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Jason _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
