Hi, I have questions for bluestore (4K random write case). So far, we have used NVRAM(PCIe) as journal and SSD (SATA) as data disk (filestore). Therefore, we got performance gain from NVRAM journal. However, current Bluestore design seems that data (4K aligned) is written to data disk first, then metadata is written to WAL rocksdb. This design can remove “double write” in objectstore, but in our case, NVRAM can not be utilized fully. So, my questions are that 1. Can bluestore write WAL first as filestore? 2. If not, using bcache or flashcache for NVRAM on top of SSDs is right answer? Thanks -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
