On Wed, 20 Sep 2017, Burkhard Linke said: > The main reason for having a journal with filestore is having a block device > that supports synchronous writes. Writing to a filesystem in a synchronous > way (e.g. including all metadata writes) results in a huge performance > penalty. > > With bluestore the data is also stored on a block devices, and thus also > allows to perform synchronous writes directly (given the backing storage is > handling sync writes correctly and in a consistent way, e.g. no drive > caches, bbu for raid controllers/hbas). And similar to the filestore journal Our Bluestore disks are hosted on RAID controllers. Should I set cache policy as WriteThrough for these disks then? Sean Purdy > the bluestore wal/rocksdb partitions can be used to allow both faster > devices (ssd/nvme) and faster sync writes (compared to spinners). > > Regards, > Burkhard _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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