Can you expand on this, like a LOT? I recall a while ago you brought up some performance issues and said you had found hacks for them. Were those issues actually unresolved or are you talking about something else? I don't see any recent posts by you about problems with your Cyrus install. I'm struggling to see the mechanism by which mirroring creates a problem. Were you resilvering at the time? Pascal Gienger wrote: > Our latency problems went away like a miracle when we detached one half of > the mirror (so it is no more a mirror). > > Read-Rates are doubled (not per device, the total read rate!), latency is > cut off. No more latency problems. > > When attaching the volume again, resilvering puts the system to a halt - > reads and writes do block for seconds (!). We will go on directly with Sun > to solve the problem. Their "lowest I/O-priority to resilver disks" does > not seem to be effective. It really blocks the kernel and you end up with > thousand locks in "zfs_zget". > > We have two SAN volumes in different buildings which are NOT the > bottleneck, tests show it. > > Pascal > ---- > Cyrus Home Page: http://cyrusimap.web.cmu.edu/ > Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki > List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html > ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
