Hi Listers, Configuration :
Software : Aix 4.3.3 / Oracle 9.2.0.3 Hardware ; 6 CPU, 16 Go RAM, DAS clarriion FC4500 with 2 Storage Processors (SP) 1 Fibre channel link by SP 10 x 36 Go Disks 512 Mo of cache Disk configuration : 1 RAID group raid1 (2 disks) Lun bound to SPA --> hdisk1 --> VG01 1 RAID group raid5 (9 disks - stripe size 128Ko) Lun bound to SPB --> hdisk2 --> VG02 1 RAID group raid5 (6 disks - stripe size 64Ko) Lun bound to SPA --> hdisk3 --> VG03 1 RAID group raid1(2disks) Lun bound to SPB --> hdisk4 --> VG04 1 Hot spare Now the problem : Nota : Oracle block size is 8Ko I created 8 x 8 Go raw logical volumes (aka raw devices) on VG02 when I create a 64 Go tablespace (8 datafiles) on these, it takes 2h30 then I created 10 x 8Go raw logical volumes on VG03 But when I create a 80 Go tablespace (10 datafiles) on these, it takes only 30 minutes. That's 5 times less for a bigger size !! What can be the reason ? So far, the differences I see are : - VG and so LVs are attached to a different controller (SPA vs SPB) - stripe size is different (64k vs 128K) - stripe width is different (6 disks vs 9 disks) - VG Partition Size is different (256 Mo vs 512 Mo) Which one do you think is the main culprit ? As I'm not on site and I don't want to change all at once, I plan to ask first for a double check of the FC links, controllers and Luns configuration But after that except asking to rebuild with the same stripe size , width and PPsize, I'm at a loss. Any ideas ? except BAARF of course ;-)) Thanks in advance Gilles Parc carpe diem !! -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Gilles PARC INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).