Hi All,
I have a HP Proliant with RHEL 5.2 installed. I have been told that it has 4 internal disks, 2 72GB and 2 146GB. I need to setup oracle filesystems on the 2 146GB drives with mirroring. (The 72GB drive that contains the OS should also be mirrored once I know how to)

The first problem is that fdisk -l only shows 2 disks ..?? instead of 4, I thought maybe software RAID mirroring was setup but that is not the case, plus mdadm -Q shows those devices are not md devices. Here's the output:
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(fdisk -l output, omitting the SAN devices)
Disk /dev/cciss/c0d0: 73.3 GB, 73372631040 bytes
255 heads, 32 sectors/track, 17562 cylinders
Units = cylinders of 8160 * 512 = 4177920 bytes

Device Boot Start End Blocks Id System
/dev/cciss/c0d0p1 * 1 25 101984 83 Linux
/dev/cciss/c0d0p2 26 2535 10240800 83 Linux
/dev/cciss/c0d0p3 2536 4041 6144480 83 Linux
/dev/cciss/c0d0p4 4042 17562 55165680 5 Extended
/dev/cciss/c0d0p5 4042 5045 4096304 83 Linux
/dev/cciss/c0d0p6 5046 5798 3072224 82 Linux swap / Solaris
/dev/cciss/c0d0p7 5799 6049 1024064 83 Linux
/dev/cciss/c0d0p8 6050 17447 46503824 83 Linux
/dev/cciss/c0d0p9 17448 17562 469184 8e Linux LVM

Disk /dev/cciss/c0d1: 146.7 GB, 146778685440 bytes
255 heads, 63 sectors/track, 17844 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/cciss/c0d1p1 * 1 17844 143331898+ 8e Linux LVM

root@host# cat /proc/partitions
major minor #blocks name

104 0 71652960 cciss/c0d0
104 1 101984 cciss/c0d0p1
104 2 10240800 cciss/c0d0p2
104 3 6144480 cciss/c0d0p3
104 4 1 cciss/c0d0p4
104 5 4096304 cciss/c0d0p5
104 6 3072224 cciss/c0d0p6
104 7 1024064 cciss/c0d0p7
104 8 46503824 cciss/c0d0p8
104 9 469184 cciss/c0d0p9
104 16 143338560 cciss/c0d1
104 17 143331898 cciss/c0d1p1
(omitted SAN disks)

root@host# mdadm -Q /dev/cciss/c0d0
/dev/cciss/c0d0: is not an md array
/dev/cciss/c0d0: No md super block found, not an md component.
root@host# mdadm -Q /dev/cciss/c0d1
/dev/cciss/c0d1: is not an md array
/dev/cciss/c0d1: No md super block found, not an md component.

root@host# cat /etc/issue
Red Hat Enterprise Linux Server release 5.2 (Tikanga)
Kernel \r on an \m

root@host# uname -a
Linux host 2.6.18-92.el5 #1 SMP Tue Apr 29 13:16:12 EDT 2008 i686 i686 i386 GNU/Linux
root@host#

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So the first question is, how can I see the 4 internal disks?
Secondly, can I setup mirroring on the OS as well as the oracle filesystems which need to be created? DO I still need to do RAID mirroring (quite cryptic from what I have read/researched) or can I do LVM mirroring like in HPUX or Solaris??

Unfortunately as we all know, this is urgent (isn't it always) I would really really appreciate all help and advice.

Thanks very much
uzee

wow 56 views so far and no reply
anyways... I just wanted to share what I found out, in case someone else stumbles upon this thread.

The system is configured with hardware raid 1+0 via HP Smart array configuration utility, that is why the OS only sees one device although there are 2. hpacucli is the command to check it.

Most all HP servers have raid controllers these days. That you can set hardware raid up on. It is the best way to insure integrity and fail over if a drive crashes.

You don't see many people asking questions of this type and is most likely the reason for the amount of views with no replies.

Never use software raid because of the overhead it places on the OS itself.