topic Re: raw partition in Operating System - HP-UX

raw partition

Simon_51 — Mon, 24 Feb 2003 05:57:06 GMT

How do I create a raw partition on HP-UX 11.x?
After I pvcreate the disk, do I use hfs or vxfs. Can someone straighten me out on this?

Thanks
Si

Re: raw partition

Ravi_8 — Mon, 24 Feb 2003 06:12:38 GMT

Hi,

you can't create raw partition in HP-UX.
you can craete file system partitions since hp-ux uses lvm .
Here is the procedure after pvcraete

#pvcreate -f /dev/rdsk/cxtxdx (cxtxdx is the disk)
#mkdir /dev/vg01 (assuimg you are crating volume group 01)
#cd /dev/vg01
#mknod group c 64 0x010000
#vgcreate vg01 /dev/dsk/cxtxdx
(vg 01 has been created now)
#lvcraete -L /dev/vg01
#newfs -F vxfs /dev/vg01/rlvolx ( x value returned by previous command)
#mount /dev/vg01/lvolx /

Re: raw partition

monasingh_1 — Mon, 24 Feb 2003 07:57:03 GMT

What you should do is do not create any file system on it.

After creating lvol, just leave it without filesystem after creating .
Use rlvolx instead of lvol in the application.
you can not mount the rlvolx but if you use raw partition, the application will access it directly.

hope this helps..

Re: raw partition

KCS_1 — Mon, 24 Feb 2003 08:18:30 GMT

hi,

I agree with Monasingh's messgage.

#pvcreate -f /dev/rdsk/cxtxdx (cxtxdx is the disk)
#mkdir /dev/vg01 (assuimg you are crating volume group 01)
#cd /dev/vg01
#mknod group c 64 0x010000
#vgcreate vg01 /dev/dsk/cxtxdx
(vg 01 has been created now)
#lvcreate -L /dev/vg01

after created logical volume in your system, you can see rlvolX and lvolX logical volumes in the /dev/vg01.
----------------------------
rlvolX : raw(character) device file

lvolX : Block device file

----------------------------

good luck!!

Re: raw partition

Stefan Farrelly — Mon, 24 Feb 2003 08:30:08 GMT

simlpy create an lvol the normal way, to the size you want, but then miss out the last 2 steps (do not newfs it or mount it or add it to /etc/fstab). Now you have a raw filesystem ready to use! (/dev/vgXX/rlvolYY)

Re: raw partition

Simon_51 — Mon, 24 Feb 2003 15:26:23 GMT

This was very helpful, thank you all.

Si

Re: raw partition

A. Clay Stephenson — Mon, 24 Feb 2003 15:33:42 GMT

Of course, your other option is to use the entire disk, e.g. /dev/rdsk/c3t5d0 and bypass LVM completely. Having said this, I would tend to use LVM for raw volumes because the overhead is very slight and the gains in flexibility are quite large.