Robert Milkowski wrote: > Hello James, > > Sunday, December 16, 2007, 9:54:18 PM, you wrote: > > JCM> hi Frank, > > JCM> there is an interesting pattern here (at least, to my > JCM> untrained eyes) - your %b starts off quite low: .... > JCM> All of which, to me, look like you're filling a buffer > JCM> or two. > > JCM> I don't recall the config of your zpool, but if the > JCM> devices are disks that are direct or san-attached, I > JCM> would be wondering about their outstanding queue depths. > > JCM> I think it's time to break out some D to find out where > JCM> in the stack the bottleneck(s) really are. > Maybe he could try to limit # of queued request per disk in zfs to > something smaller than default 35 (maybe even down to 1?)
Hi Robert, yup, that's on my list of things for Frank to try. I've asked for a bit more config information though so we can get a bit of clarity on that front first. James C. McPherson -- Senior Kernel Software Engineer, Solaris Sun Microsystems http://blogs.sun.com/jmcp http://www.jmcp.homeunix.com/blog _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
