[ale] Looking for recommendations on LVM + soft Raid on home server

[Lightner, Jeff]

I agree with the idea of using LVM for / and partition for /boot.  As stated before this is the way RHEL/CentOS does it by default.   Here we use hardware RAID so don't bother with meta disks.  If you don't have hardware RAID I'd definitely recommend making the meta disks first then laying out LVM on top of the meta disks.





-----Original Message-----
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of Chuck Payne
Sent: Tuesday, March 20, 2012 7:44 AM
To: Atlanta Linux Enthusiasts
Subject: Re: [ale] Looking for recommendations on LVM + soft Raid on home server

On Tue, Mar 20, 2012 at 7:36 AM, Jim Kinney <jim.kinney at gmail.com> wrote:
> It's OK to have / on LVM. That allows adding more space if required later.
>
> A typical Fedora/RHEL/CEntOS install will put /boot on a partition and a
> single partition for a physical volume. That partition is split between /
> and swap so that swap can float as well if you add more RAM later. / is all
> one big partition typically but later version of desktop installs make a
> separate /home.
>
> As you are looking at RAID as well, make the md devices and put LVM on top.
> The caveat is you want swap on non-RAID as it handles itself sort of
> raid-like already. (That said, swap on raid is reliable but it gets slow on
> heavy used systems)
>
> md0 for /boot
> sda2 for swap
> sdb2 for swap
> md1 for LVM pv_main
> subdivide pv_main for OS layout. into /, /home, /var, etc...
>
> On Mon, Mar 19, 2012 at 10:35 PM, Neal Rhodes <neal at mnopltd.com> wrote:
>>
>> I'm getting ready for the 3rd time installing Centos 6.2 on new server for
>> home.   We usually figure we get to install at least twice on a new OS and
>> hardware.
>>
>> This time the re-install is to get the drive partitioning and soft RAID
>> right.    I didn't have the 2nd drive for the 2nd install.
>>
>> Normally our prior Fedora servers have been
>>
>> /dev/md1 on / type ext3 (rw)
>> /dev/md0 on /boot type ext3 (rw)
>> /dev/md2 on /u type ext3 (rw)
>>
>> This time around I was thinking on using LVM, I guess to just get more
>> experience with LVM.   However, since you wouldn't want to risk resizing
>> /boot or root filesystem,  I see no point in them being in LVM.
>>
>> Primary drive is 1.5TB, of which 220GB is occupied by Windows7 boot, which
>> I'd prefer to not disturb.
>> 2nd drive is 1TB.
>>
>> So, I'm thinking of a layout like this:
>>
>> /dev/md0 on /boot type ext3 (rw)   (whatever boot takes)
>> /dev/md1 on / type ext3 (rw)          (about 50GB)
>> /dev/md2 on VolumeGroup00         (about 1TB)
>>           And logical volumes for /home and /u, which can be resized as
>> needed between /home and /u
>> /dev/sda? on /u2                              (remaining 300GB, not Raid
>> 1, just on the one bigger drive)
>>
>>
>> Is that going to work?   Other thoughts?
>>
>> Neal Rhodes
>> MNOP Ltd
>>
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>
>
>
> --
> --
> James P. Kinney III
>
> As long as the general population is passive, apathetic, diverted to
> consumerism or hatred of the vulnerable, then the powerful can do as they
> please, and those who survive will be left to contemplate the outcome.
> - 2011 Noam Chomsky
>
> http://heretothereideas.blogspot.com/
>
>
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 Are you using a card to do your raid? If you are doing a soft raid,
leave /boot /dev/sda1, I haven't seen a box use /dev/mdx for boot.
Just like I haven't see a box use /dev/VolGroup/LogVolboot. Most
software raid have to be load, until the drivers are loaded, how will
your server know you are using a softraid.

If it's a hardware raid, then by all means set up the /boot as a read.

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