bfrie...@simple.dallas.tx.us said: > No. I am suggesting that all Solaris 10 (and probably OpenSolaris systems) > currently have a software-imposed read bottleneck which places a limit on > how well systems will perform on this simple sequential read benchmark. > After a certain point (which is unfortunately not very high), throwing more > hardware at the problem does not result in any speed improvement. This is > demonstrated by Scott Lawson's little two disk mirror almost producing the > same performance as our much more exotic setups.
Apologies for reawakening this thread -- I was away last week. Bob, have you tried changing your benchmark to be multithreaded? It occurs to me that maybe a single cpio invocation is another bottleneck. I've definitely experienced the case where a single bonnie++ process was not enough to max out the storage system. I'm not suggesting that the bug you're demonstrating is not real. It's clear that subsequent runs on the same system show the degradation, and that points out a problem. Rather, I'm thinking that maybe the timing comparisons between low-end and high-end storage systems on this particular test are not revealing the whole story. Regards, Marion _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
