[ceph-users] RBD read-ahead didn't improve 4K read performance

hi， I upgraded CEPH to 0.87 for rbd readahead , but can't see any performance improvement in 4K seq read in the VM. How can I know if the readahead is take effect? thanks. ceph.conf [client] rbd_cache = true rbd_cache_size = 335544320 rbd_cache_max_dirty = 251658240 rbd_cache_target_dirty =

Re: [ceph-users] RBD read-ahead didn't improve 4K read performance

...@zte.com.cn Envoyé: Vendredi 21 Novembre 2014 03:58:38 Objet: [ceph-users] RBD read-ahead didn't improve 4K read performance hi， I upgraded CEPH to 0.87 for rbd readahead , but can't see any performance improvement in 4K seq read in the VM. How can I know if the readahead is take effect