slackware 11 and software RAID ?

indabhutt · 11-13-2008, 10:02 AM

i need help setting up RAID in my slackware 11 system

i was following this guide
http://slackware.osuosl.org/slackwar...EADME_RAID.TXT

and so far reached here

http://img259.imageshack.us/img259/2752/33881396zr1.png

when i try to use mdadm from the slackware cd it says there is no such file .. am i doing something wrong ?

edit:+: and in which partition would i install slackware ? (the pic above)

indienick · 11-13-2008, 11:28 AM

First things first, I used this guide when I set up a RAID at work - it hasn't failed me, yet.

I get this idea that mdadm is not installed on the Slackware install DVD - I could be proven wrong by running

Code:

# find / -iname mdadm

. As for which partition to install Slackware to, I really do not know.

My tried-and-true method for doing funky hardware arrangements (from RAID arrays, to setups with more than one HD) is to have a dedicated boot drive to work from.

bgeddy · 11-13-2008, 12:16 PM

Quote:

I get this idea that mdadm is not installed on the Slackware install DVD - I could be proven wrong by running

It should be - on a Slackware 12.1 install dvd it's in /sbin when booted.

indabhutt · 11-13-2008, 12:48 PM

@indienick

i have read that , but i guess i need to read that again .. i might have missed something earlier ..

@bgeddy

its not in slackware 11 , anyway am using slax live cd to mdadm RAID ...

as for installation of slackware 11 to the partition .. am still confused too :|

bgeddy · 11-13-2008, 12:59 PM

Quote:

its not in slackware 11 , anyway am using slax live cd to mdadm RAID ...

Well the guide you give the link to here is from Slackware 12.1 so that wouldn't surprise me.

In any case using a guide from one version (12.1) to setup another (11) may well give you problems.

mRgOBLIN · 11-13-2008, 01:51 PM

Yes mdadm was introduced to the initrd in slackware-12.0. Versions prior to that will use raidtools.

An article dealing with slackware and raidtools is here. http://www.userlocal.com/articles/ra...ware-linux.php

indabhutt · 11-13-2008, 02:45 PM

i still cant figure out where to install the actuall operating system (slackware 11) . is it possible to install slackware on a partition formatted with linux raid autodetect ?

mRgOBLIN · 11-13-2008, 03:21 PM

Check to see that the raid is started with.

Code:

cat /proc/mdstat

Should show something like /dev/md0

That is where you need to install to (may be md1 md2 etc..)

indabhutt · 11-13-2008, 03:27 PM

thanks a lot

indabhutt · 11-14-2008, 01:00 AM

Quote:

Start by creating the RAID array for your root filesystem.

- RAID 0:
mdadm --create /dev/md0 --level 0 --raid-devices 2 \
/dev/sda2 /dev/sdb2

- RAID 1:
mdadm --create /dev/md0 --level 1 --raid-devices 2 \
/dev/sda1 /dev/sdb1

- RAID 5:
mdadm --create /dev/md0 --level 5 --raid-devices 3 \
/dev/sda2 /dev/sdb2 /dev/sdc2

one more doubt .. thats ^^ from the guide ...

err same /dev/md0 block device for all the raid ? that cant be right ...

mRgOBLIN · 11-14-2008, 01:39 AM

No they are 3 different examples for 3 different levels of raid 0,1 and 5.

Just choose the one that applies to you.

indabhutt · 11-14-2008, 01:51 AM

ah ok .. thanks

so its possible to create different RAID setups on the same HDD .. but on different partition .. right ?

these stupid doubts keep coming up

indabhutt · 11-14-2008, 02:28 AM

@mRgOBLIN ,John Jenkins ?

i was reading your guide ... very helpfull .. thanks a lot

mRgOBLIN · 11-14-2008, 04:56 PM

Quote:

Originally Posted by indabhutt

ah ok .. thanks

so its possible to create different RAID setups on the same HDD .. but on different partition .. right ?

these stupid doubts keep coming up

Yes it is.

you can for example have

md0 raid0 sda1,sdb1
md1 raid1 sda2,sdb2
md2 raid0 sda3,sdb3 etc...

indabhutt · 11-15-2008, 06:37 AM

ah ok .. thanks very much