simple RAID setup

[Jackson Doak]

for simplicity, try to use hardware raid, e.g. created in bios. use either
RAID 0 (striping, more speed but lose on drive, loose them all) or RAID 1
(mirroring, gives redundancy)


On Sat, Dec 29, 2012 at 3:42 PM, Paul Gear <paul at libertysys.com.au> wrote:

>  On 12/29/2012 12:36 PM, Tom Sparks wrote:
>
> I am looking at setup a RAID
>
> what is the simplest setup?
>
>
> RAID 1 is recommended for boot disks.  My preferred setup is to set up all
> boot disks (usually 2, but i've been known to go as high as 4) as follows:
>
> 1. primary partition, 1 GB or so, Linux RAID partition (type 0xFD in
> fdisk, known as physical volume for RAID in the server/alternate
> installer).  Once these have been combined into a RAID partition (usually
> /dev/md0), i create an ext3 filesystem for /boot on it.
>
> 2. primary or logical partition, rest of the disk, Linux RAID.  Once these
> have been combined into a RAID partition (usually /dev/md1), i create an
> LVM physical volume (PV) on this, create a volume group (VG) named for the
> host and a sequence number (e.g. myserv0).  Then you can create logical
> volumes (LVs) in the VG that act like physical partitions, but can be moved
> and grown as needed.
>
> 3. LVs in the root VG:
>
>    - lv00 4GB swap
>    - lv01 8GB+ /
>    - lv02 8GB+ /var
>    - rest of VG can be allocated as desired, but often it goes in /home
>
> It's not required to have a separate /boot nowadays, but i prefer it
> because it has been very stable and trouble-free for me for many years.  I
> have an idea that the Ubuntu installer nowadays might even have a canned
> configuration that sets up RAID 1 + LVM.  But don't quote me on that one.
>
> I've got a bit more at my wiki (hasn't been updated in a while, though):
>
>    - http://linuxman.wikispaces.com/search/view/raid
>    - http://linuxman.wikispaces.com/Software+RAID+troubleshooting
>    - http://linuxman.wikispaces.com/Recovering+from+a+RAID+drive+failure
>    - http://linuxman.wikispaces.com/filesystem+layers+overview
>
> I'm sure there are better guides than mine if you care to search, but i
> haven't found anything like the filesystem layers overview elsewhere.
>
> If you have any troubles, jump on IRC in #ubuntu-au and ping me
> (blahdeblah) and i'll see what i can do to help.
>
> Regards,
> Paul
>
>
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>
>
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