Interesting. What's your kernel patch level? We're running on 125101-10 with the exact same configuration as you (mirrored to two arrays, in separate buildings even) and haven't seen this problem. /dale On Nov 13, 2007, at 1:23 AM, 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 > -- Dale Ghent Specialist, Storage and UNIX Systems UMBC - Office of Information Technology ECS 201 - x51705 ---- 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
