Re: Raw device questions... OR Tech support says we are wrong

Eddie Roberts <nws@stout.atd.ucar.edu> wrote: : I've been following the numerous threads about setting up an Informix ... : "Do you need to specify an offset into a logical : volume when using the logical volume managers raw : device (ie. rlvolN)?" No. : OR : "Does HP-UX write partition (ie logical volume) information : or disk drive information on the drive that could be destroyed : when using the raw device driver (ie. rlvolN)?" No. : HP tech support said absolutely not!! Correct! : Informix tech support said this was dependent on the OS and the way the : OS manages disk drives and partitions. Exactly correct. This can be a problem under Solaris. : Now, I'm a little confused and a lot nervous!!!! The tech support from both : companies said no offset is needed in the raw disk partition when using : the LVM's character device driver under HP-UX 10.20, BUT I've read several : posts where DBAs have destroyed their disks under this scenario. Not an issue for HP-UX. LVM hides paritioning information from being used. Using the old hard sectoring is painful and playing with fire. However, if say, using Solaris, this is a problem: partitioning information is not hidden from raw devices. Yes, I've seen this happen in front of me.... -- Roger M. Shimada Internet: rms@primenet.com