Are you using linux for the initiator? If so, what is the throughput you get from just using this open-iscsi initiator connected to tgt with a ram disk?
I just installed RBD here for work, so let me check it out. What io tool are using and if it is something like fio could you post the arguments you used to run it? On Aug 21, 2014, at 4:10 PM, Wyllys Ingersoll <wyl...@gmail.com> wrote: > > Im looking for suggestions about maximizing performance when using an RBD > backend (Ceph) over a 10GB Ethernet link. In my testing, I see the read > throughput max out at about 100Mbyte/second for just about any block sizes > above 4K (below 4K it becomes horribly slow) and write operations are about > 40Mbyte/second. > > Using librados directly to read from the same backend pool/image yields much > higher numbers, so the issue seems to be in the iscsi/bs_rbd backend. > Regardless of the data sizes being read, the max thruput I am seeing is about > 80% slower than using librados directly. > > Any suggestions would be much appreciated. > > thanks, > Wyllys > > > -- > You received this message because you are subscribed to the Google Groups > "open-iscsi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to open-iscsi+unsubscr...@googlegroups.com. > To post to this group, send email to open-iscsi@googlegroups.com. > Visit this group at http://groups.google.com/group/open-iscsi. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to open-iscsi+unsubscr...@googlegroups.com. To post to this group, send email to open-iscsi@googlegroups.com. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
