...though, we have seen super-greedyness of ZFS when resilvering. ;) On Nov 13, 2007, at 09:17, Dale Ghent wrote: > > 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 ---- 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
