Dear Ceph folks, When setting up an all flash Ceph cluster with 8 nodes, I am wondering whether should i disable (or turn off) DB and WAL for SSD based OSDs for better 8K IO performance. Nornally for HDD OSDs, i used to create a 30GB+ partitions on separate SSDs as DB/WAL for them. For (enterprise level)SSD-based OSDs, one way is to create a partition on every SSD OSD as DB/WAL, and then use the rest as the data partition of the OSD. However, I am wondering whether such operation would improve performance or degrade performance? Since WAL is just a pure write buffering, it could cause double writes on the same SSD and thus cause damage to the performance... Any comments, suggestions are highly appreciated, Samuel huxiaoyu@xxxxxxxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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