Arch Linux

Mr Green

Forum Fellow

From: U.K.

Registered: 2003-12-21

Posts: 5,914

Website

Raid1 here I come

Ok I have backed up my main drive...

Want to go raid1 can I do it without reinstalling Arch?

Wiki seems to use cfdisk to create partitions already have them on main drive ?

Will I need to set up mirror drive using cfdisk or will mdadm create them?

TIA

MrG

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Mr Green

thomas23

Member

From: Canada, Montreal

Registered: 2005-06-11

Posts: 40

Re: Raid1 here I come

Hi,

Good thing to have made a backup  !

Here is a howto a bit more detailled on raid stuff : http://tldp.org/HOWTO/Software-RAID-HOWTO.html

This documents also explains how to transform an ordinary disk into a raid array with the data still on it.

But a quick search in the wiki with the raid keyword hae give up some interesting stuff...

Update to raid
http://wiki.archlinux.org/index.php/Con … em_to_RAID

Install raid from scratch (just in case...)
http://wiki.archlinux.org/index.php/Ins … AID_or_LVM

Hope this can help ! Good luck

Mr Green

Forum Fellow

From: U.K.

Registered: 2003-12-21

Posts: 5,914

Website

Re: Raid1 here I come

Yeah the wiki stuff may do the trick...

In RAID1 will I notice any access speed increase?

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Mr Green

thomas23

Member

From: Canada, Montreal

Registered: 2005-06-11

Posts: 40

Re: Raid1 here I come

Yes, the thing is that in raid 1, when reading data, disks work in a asynchronous way. So they work togheter and each of them get a different set of data. Reading is fast with raid 1. In the other hand, writing is as fast as the slowest of your drives.

I personaly love raid 5. Its speed in writing is between raid 0 and 1, in reading it is faster than raid 1, since you have to have 3 disks for raid 5 to work... Raid 1 with 4 disks will probably read faster. And about safety of data, as good as a raid 1 with 2 disks.

Mr Green

Forum Fellow

From: U.K.

Registered: 2003-12-21

Posts: 5,914

Website

Re: Raid1 here I come

Dude I got two 250gb sata drives. ...

I'm going to play with a disc image on a loop device first ..... play around with it

Do not want to use grub shoulds work with lilo

Yeah Raid1 will be fine for now

May need to resize /home to take add /media

You using LVM as per wiki?

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Mr Green

thomas23

Member

From: Canada, Montreal

Registered: 2005-06-11

Posts: 40

Re: Raid1 here I come

Nope, never used LVM at all...

Mr Green

Forum Fellow

From: U.K.

Registered: 2003-12-21

Posts: 5,914

Website

Re: Raid1 here I come

 cat /proc/mdstat 
Personalities : [raid1] [raid6] [raid5] [raid4] 
unused devices: <none>

Nothing yet.... soon lol

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Mr Green

osigen

Member

From: cynic tub

Registered: 2005-06-18

Posts: 36

Website

Re: Raid1 here I come

Too hard to RAID , isn't it? :-)

By the way tpowa recent iso (5 Oct 06)  and wiki instructions about RAID and LVM are outdated and incompatible.

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"What we cannot speak about we must pass over in silence" L. Wittgenstein

Mr Green

Forum Fellow

From: U.K.

Registered: 2003-12-21

Posts: 5,914

Website

Re: Raid1 here I come

thinking about trying out hardware raid instead

If you want to try out raid without messing up system then set up a couple of loopdevices first ....

As always backup backup backup first!!!!

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Mr Green

osigen

Member

From: cynic tub

Registered: 2005-06-18

Posts: 36

Website

Re: Raid1 here I come

In my case Hardware RAID is unsupported :-(
Intel ICH8R chipset (Intel Matrix Storage) has NO interesting for Linux.

Anyone should stop buying Intel Matrix Storage motherboards. I will do :-)

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"What we cannot speak about we must pass over in silence" L. Wittgenstein

Mr Green

Forum Fellow

From: U.K.

Registered: 2003-12-21

Posts: 5,914

Website

Re: Raid1 here I come

well you can buy cards cheap enough....

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Mr Green

osigen

Member

From: cynic tub

Registered: 2005-06-18

Posts: 36

Website

Re: Raid1 here I come

I just finished my new RAID5 system :-)
You may find useful my Serial ATA2 and software RAID performance comparison

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"What we cannot speak about we must pass over in silence" L. Wittgenstein

Mr Green

Forum Fellow

From: U.K.

Registered: 2003-12-21

Posts: 5,914

Website

Re: Raid1 here I come

Wow!   8)

I was thinking more of raid1 for my setup [two drives!]

Software Raid... would be interested in how you set it up

/me feels a wiki page coming on...

As a side note was there any reason why you did not use Hardware Raid on mobo ?

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Mr Green

osigen

Member

From: cynic tub

Registered: 2005-06-18

Posts: 36

Website

Re: Raid1 here I come

All you need are here:
Archlinux base or current from tpowa recent iso

Follow the instructions :
Installing with Software RAID or LVM

If you have troubles with grub read this: http://bbs.archlinux.org/viewtopic.php?t=26484

If your kernel hungs read this
http://bbs.archlinux.org/viewtopic.php?t=27061

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"What we cannot speak about we must pass over in silence" L. Wittgenstein

Mr Green

Forum Fellow

From: U.K.

Registered: 2003-12-21

Posts: 5,914

Website

Re: Raid1 here I come

Cool thanks very much .... good luck with your system

Its Cool its runs on Arch ;-)

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Mr Green