Re: Long checkpoint woe

Posted in 2006

Neil Truby — Fri, 31 Mar 2006 16:49:02 +0100 — source: Usenet: comp.databases.informix

"Roy Mercer" <roy.mercer@gmail.com> wrote in message news:1143812680.849666.108640@z34g2000cwc.googlegroups.com... > time dd if=/dev/tempdbs01 of=/dev/null bs=2k count=10240 > 10240+0 records in > 10240+0 records out > > real 0m2.77s > user 0m0.05s > sys 0m0.75s > > time dd if=/dev/tempdbs01 of=/tmp/del.out bs=2k count=10240 > 10240+0 records in > 10240+0 records out > > real 0m3.11s > user 0m0.08s > sys 0m1.12s It's the write times to raw devices that is the relevant metric, eg: # time dd if=/dev/zero of=/dev/md/rdsk/d122 bs=2k count=10240 10240+0 records in 10240+0 records out real 1m0.27s user 0m0.01s sys 0m0.50s