[ale] Continuing Saga of Centos 5.6

Wed Aug 10 14:58:08 EDT 2011

This shows /boot is on your first WD drive but root is on the 3 Ware drive.

sda = 3ware and /dev/sda1 (first partition) is LVM VolGroup00 - Logvol00 is / (which is root) and is in LVM Group 00.

sdb = WD and /dev/sdb1 (first partition) is /boot (not in LVM)

Further it made your second partition of sdb (/dev/sdb2) in a new LVM VolGroup01.

It then added your second WC (/dev/sdc) as part of VolGroup00.   This means your primary VG is comprised of both the 3ware disk and one of the WD disks.   Nothing wrong with that but it doesn't sound like what you expected.

When you do the install there is an option to let you see/modify the disk configuration after it sets it up.   We typically do that because we like to carve up the initial VG (VolGroup00) into multiple filesystems such as /, /tmp, /usr, /opt, /var, /home with preset sizes and then leave the rest of the space unallocated for future use (or create other application specific filesystems on it).

LVM lets you put as many drives (or partitions thereof) as you want into a single VG or you can create multiple VGs each using different drives (or partitions).

________________________________
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of Greg Clifton
Sent: Wednesday, August 10, 2011 1:52 PM
To: Atlanta Linux Enthusiasts
Subject: Re: [ale] Continuing Saga of Centos 5.6

When I did the initial install, the installer saw the 3Ware mirror set as the primary drive and wanted to install there, I told it to install to the WD drives and then went with defaults. I am an amateur at this, so I probably hosed something but when I started over and chose install it read the existing install and shows the following:

SDA 953663MB AMCC [i.e. 3Ware] 9650Se-2LP disk
SDB 239422 ATA WDC WD2503ABYX-0
SDC 239422 ATA WDC WD2503ABYX-0

LVM Groups 00 14320320MB
 Logvol 00 / ext3 1426368
 Logvol 01  swap 5952Mb

Hard Drives
/dev/sda1 volgroup 00 LVM PV 953663MB Start 1 End 121575
/dev/sdb1 /dev/sdb1 / boot ext 3 101MB Start 1 End 13
/dev/sdb2 volgroup 01 LVM PV 239319MB Start 14 End 30522
/dev/sdc1 volgroup 00 LVM PV 239429MB Start 1 End 30522

I do recall there used to be a lot of trouble getting software RAID running off the motherboard controllers under Linux. Is it possible that we need a driver for this Intel SATA controller that is not on the install disc (BTW the machine is not plugged into the internet at this time, static IPs here and I'm not sure how to configure that during the install)?

On Wed, Aug 10, 2011 at 11:11 AM, Lightner, Jeff <JLightner at water.com<mailto:JLightner at water.com>> wrote:
I'm pretty sure you can't do /boot on LVM in RHEL/CentOS given that even when they default to an LVM layout during install they still always create /boot as the first hard partition and put LVM as the second hard partition.

Every RHEL/CENTOS server we have has /boot on a partition rather than an LV for this reason.  Never tried forcing it to LVM.

-----Original Message-----
From: ale-bounces at ale.org<mailto:ale-bounces at ale.org> [mailto:ale-bounces at ale.org<mailto:ale-bounces at ale.org>] On Behalf Of Michael B. Trausch
Sent: Wednesday, August 10, 2011 10:12 AM
To: Atlanta Linux Enthusiasts
Subject: Re: [ale] Continuing Saga of Centos 5.6
On 08/10/2011 09:33 AM, Derek Atkins wrote:
> Even Fedora 15 still uses Grub v1.
>
> It's sufficiently different that Red Hat hasn't switched over.

A shame, really.  GRUB 2 is far superior in every way.

       --- Mike
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