RAW Disk space setup

[MikeL_4]

I have a new server that has 3 LUN's attached on SAN device that I have multipathed: /dev/mapper/mpath1, mpath2, and mpath3

The DBA's want 80Gb on each LUN setup as RAW space for the database and the rest as LVM space...

Not sure how to set this up with the RAW space and rest to LVM???

[avizen9 · Accepted solution]

HI MikeL

first you need to create PV,VG and then you can create LVM

For RAW space follow as below.
lvcreate -l LExx -n lvoln -r N /dev/vgNUM

chown informix:informix /dev/vgNUM/rlvolxx
chmod 666 /dev/vgNUM/rlvolxx

you need to ask your DBA they want to use these raw space for which user and group, in above example its for informix user and informix group.

let me know how it goes, thanks,

[Ivan Ferreira]

The way RAW devices are used vary depending of the Linux distro and version. What is your Linux version?

Probably you can partition a disk and use one partition as raw device and another as physical volume. I'm not sure about the performance impact of this configuration.

[MikeL_4]

This is on a Red Hat Version 5.3 server...

and for Oracle database....

[Ivan Ferreira]

Please see:

http://www.held.org.il/blog/?p=32
http://run.tournament.org.il/raw-devices-for-oracle-on-redhat-rhel-5/comment-page-1/

[MikeL_4]

unfortunately DBA's want the space to be true RAW and not RAW under LVM....