topic Re: Disk Stripes in Operating System - HP-UX

Disk Stripes

Jason_309 — Mon, 14 Feb 2005 16:59:02 GMT

How do you tell what your systems stripe level is?

Re: Disk Stripes

A. Clay Stephenson — Mon, 14 Feb 2005 17:02:55 GMT

I assume that you are talking about logical volumes under LVM. lvdisplay /dev/vg05/lvol1 will display the number of stripes and the Stripe Size.

Re: Disk Stripes

Jason_309 — Mon, 14 Feb 2005 17:07:35 GMT

Thank you. The way the logical volumes have been setup on the system i am now workig on they have no stripes. We are running Oracle financials and have been told the disks need to be striped. What is the best way to do this?

Re: Disk Stripes

A. Clay Stephenson — Mon, 14 Feb 2005 17:13:30 GMT

The stripe size and the number of physical volumes to stripe across is set when the logical volume is created. You first need to create a volume group and include multiple physical disks or LUN's. You then allocate each logical volume striping across these PV's typically in 64KB chunks. In general, you want to strip across as many i/o channels as possible.

Re: Disk Stripes

A. Clay Stephenson — Mon, 14 Feb 2005 17:14:57 GMT

I should add man vgcreate, lvcreate, vgextend for details. You can also do all of this from within SAM -> Disks & Filesystems.

Re: Disk Stripes

Jason_309 — Mon, 14 Feb 2005 17:15:18 GMT

So if the LV groups are setup now with no stripes i still will need to start over?

Re: Disk Stripes

A. Clay Stephenson — Mon, 14 Feb 2005 17:19:40 GMT

Yes. If there are data on the existing LVOL's, you will need to back it up first. Your other option, if you have available disk is to add more disks to your VG and then create a new LVOL with stripes and copy the data over. Since, you don't seem to be too familar with these procedures, I would strongly suggest that you get a backup first.

Re: Disk Stripes

Jason_309 — Mon, 14 Feb 2005 17:22:02 GMT

Thanks