Hello, all. In my last job, I set up a test environment to check the benefits of = CIO and JFS2 using: Oracle 9iR2 (9.2.0.6) on AIX 5.2 ML5 Machine: one partition with one processor of an IBM Regatta P690 File-systems: mounted on EMC disks (I don't remember the model) Once I was the unique user in this machine (test box), the test = consisted of measure the time took to full import from a dump file, which ended up = in +15GB of segments (tables, indexes, table partitions). Why I = considerate the import a good way to measure the benefits? Because during an import we = have data load and a lot of selects during index creation. So, I repeated the import 5 times for each of the 4 distinct = configurations, alternating: Db parameter filesystem_io_options: setall or async File-system mounted with or without CIO=20 Between each test, the machine was rebooted to completely clean any = cache and whatever... But based on the times I got, I couldn't figure out any conclusion!!! For example: CIO enabled and fs_io_opt as setall:=20 1st time: 15 min 2nd time: 16 min 3rd time: 29 min 4th time: 19 min 5th time: 25 min The times took by the import in any configuration ranged from 15 to 30 minutes, independent on the configuration. What are your comments? Did I build a good test environment using = import? Could you guess the explanation for the import range from 15 to 30 min = in the SAME configuration of file-systems, db params? Remember I were = alone in the box... Thanks in advance for your comments. Best regards, Luis Cerri =20 -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx = [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Wolfgang Breitling Sent: ter=E7a-feira, 31 de maio de 2005 14:00 To: regdba@xxxxxxxxx Cc: Oracle-l Subject: Re: JFS2 and Concurrent I/O I am using it. Not in production yet. Any specific questions? Peter Barnett wrote: > Is anyone using this? If so, what is your experience? >=20 > Thanks, >=20 --=20 Regards Wolfgang Breitling Centrex Consulting Corporation www.centrexcc.com -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l