Re: Disk Bottleneck on HP-9000 and Informix 5.07

In article <35167ACC.98DCCD52@harare.iafrica.com>, Shaun Mumford <smumford@harare.iafrica.com> wrote: >We have an HP-9000 K260 2 way, with the database on 4 2gb FWD disks off >a single controller in a High Availability Chasis. > >2 of the disks are showing at 100% utilization most of the time, with >the other 2 at 20%. > >We are using raw disk space, so can not use disk striping to try and >balance the load. We are thinking about creating more than one dbspace >and attempting to load the main tables in a more balanced way. > >The database is about 6GB in size. > >Any suggestions for either monitoring the system to narrow down the >specific problem areas, or for general tuning. We have Standard Informix >5 utilities and HP Glance. > >-- >----------------------------------------------------------------------- >| Shaun Mumford | P O Box UA 325 | Phone + 263 4 739944 | >| Systems Consultant | Union Avenue | Fax + 263 4 704946 | >| C F Tulley Associates | Harare, Zimbabwe | Cell + 263 4 11 600 920 | >----------------------------------------------------------------------- > > I do not understand the reference to not being able to use disk striping because you are using raw device I/O. The HP/UX environment performs striping at the logical volume level. When you use lvcreate you can specify the number of devices across which to stripe, the stripe size, etc. You then point the informix database space to the character device file created in the logical volume's directory under /dev. You do have to create the volume groups with all four disks in the same volume group. This is documented in the vgcreate command. Ray