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Obsolete Releases => SME Server 7.x => Topic started by: edeganay on March 27, 2007, 01:06:22 AM

Title: RAID5 SATA Pb
Post by: edeganay on March 27, 2007, 01:06:22 AM

Hello there,

I have to install SME 7.1 on a brand new machine, with 3 SATA Disks.
Every install type I did are getting me into a deadend :
Fisrt Partition (MD1) is in RAID1 (sd[abc]1) which is fine
Second partion (MD2) is also in RAID1 (sd[abc]2) which is NOT fine for me.

This is a bit strange because, from 3 available disks, SME is supposed to setup RAID5 automatically.

Does anyone have any idea of solving this pb ?

Thank's a lot !
Edd

Title: RAID5 SATA Pb
Post by: spontix on April 08, 2007, 12:25:36 AM

Hallo community,

i have the same problem.
Can you help us,
thanks a lot

spontix

Title: RAID5 SATA Pb
Post by: p-jones on April 08, 2007, 12:31:33 AM

What is the make / model of the controller ? Server ? Is the controller supported ?

Have you tried installing with just one drive active then using the admin menu to bring up the other drives.

If these choices dont work them I would suggest you go to the bugtracker.

Title: RAID5 SATA Pb
Post by: Confucius on April 08, 2007, 12:36:36 AM

Combining RAID1 (SME) with RAID5 (hardware) here ?

I suggest to install SME with the paramater "noraid" since you already run RAID5.

Harro

Title: RAID5 SATA Pb
Post by: spontix on April 08, 2007, 12:47:38 AM

Hello

No i do not combine software raid1 and hardware raid5.

I just want software raid5, the raid function of the sata controller(on board) is disabled.

I don't think the controller is the problem, cause sme makes during installation raid1.

My Board is a Asus M2N-E nForce570 Ultra.

spontix

Title: RAID5 SATA Pb
Post by: Confucius on April 08, 2007, 12:50:44 AM

RAID1 is a software issue. It needs 2 disks. It's the simplest form of RAID. It only does mirroring. RAID5 tho does striping and needs a minimum of 3 disks to function properly.

You have to make a choice here. Disable 1 disk (and enable later again) or install SME without software RAID and let the hardware do RAID5.

http://www.sohoconsult.ch/raid/raid1.html
http://www.sohoconsult.ch/raid/raid5.html

Harro

Title: RAID5 SATA Pb
Post by: spontix on April 08, 2007, 12:59:44 AM

i know harro,

the problem is, i have 3 hard disks and i want software raid5. but sme installs software raid1, but all 3 disk are recognized.

Normally sme should install software raid5, but it installs software raid1.

this is the problem.

spontix

Title: RAID5 SATA Pb
Post by: Confucius on April 08, 2007, 01:14:43 AM

The only problem is that you expect RAID5 to come as software while I just explained (with links for more info) that RAID1 is software and RAID5 is NOT.

Title: RAID5 SATA Pb
Post by: bpivk on April 08, 2007, 01:35:50 AM

Quote from: "Confucius"

The only problem is that you expect RAID5 to come as software while I just explained (with links for more info) that RAID1 is software and RAID5 is NOT.

Wrong. http://wiki.contribs.org/SME_Server:Documentation:Administration_Manual:Chapter4#4.3._Hard_Drive_Configuration
You can setup a raid5 array on SME.

Title: RAID5 SATA Pb
Post by: Confucius on April 08, 2007, 01:42:52 AM

Dang,

There goes my basic RAID knowledge. :oops:

Haven't seen that part yet. My apologies for putting people on the wrong foot with my outdated knowlegde.

Harro

Title: RAID5 SATA Pb
Post by: bpivk on April 08, 2007, 01:46:48 AM

I think that this can help.
http://bugs.contribs.org/show_bug.cgi?id=1303 (look for the first link in pdf that has a howto for adding add raid)

But i still don't know why sme doesn't install raid5.
Did you use new disks or do they contain any previous records?

And confucius i didn't know that raid5 exists with the help of software drivers but i was wrong too (read the manual some time ago and was amazed).    :lol:

Title: RAID5 SATA Pb
Post by: spontix on April 08, 2007, 01:56:33 AM

hello again,

i read the manuel, thank for the link. I try it tomorrow.
I use complete new hard disks, WD 250GB WD2500YS RE 16MB from western digital.

Is it a bug or not?

spontix

Title: RAID5 SATA Pb
Post by: pfloor on April 08, 2007, 02:03:39 AM

Check the bug tracker, namely:

http://bugs.contribs.org/show_bug.cgi?id=2015

and

http://bugs.contribs.org/show_bug.cgi?id=2492

The talk there is that Raid5 on 3 disks will be depreciated because it works the disks too hard.  The default with 3 disks is now Raid1.  

I don't know exactly when the change came about (7.1 I think) but you now need 4+ disks to do raid5.

I beleive that if you still want to do this, find the 7.0 ISO and it should install 3 disks as raid5.  Then "yum update" your way to 7.1.3.  You can still get 7.0 here:

http://mirror.contribs.org/smeserver/releases/obsolete/7.0/iso/

Title: RAID5 SATA Pb
Post by: bpivk on April 08, 2007, 12:40:30 PM

pfloor that's a nice trick.  :lol:
I would never think of that.

Edit: Added a note in the wiki.

Title: RAID5 SATA Pb
Post by: spontix on April 08, 2007, 01:03:07 PM

thanks a lot, this solve the problem.

Great community, thanks

spontix

Title: RAID5 SATA Pb
Post by: Gert on April 14, 2007, 01:44:10 AM

I think you can still install RAID5 on 3 disks with the nospare option. Can anyone confirm this? I will test it tomorrow.

Title: RAID5 SATA Pb
Post by: idp_qbn on April 14, 2007, 10:07:46 PM

The SME TEchnical Manual, CH 5 says 3 disks gives 2 x RADI1 and 1 Hot Swap
http://wiki.contribs.org/SME_Server:Documentation:Technical_Manual:Chapter5
 It's a bit confusing, since the page is listed as CH 5 but on the page it says Ch 8.

This is the automatic set up; it says nothing about how you alter this.

I think there was a change with SME 7.1.3 (or possibly 7.1.2) to the new defaults regarding RAID.

Cheers
Ian

Title: RAID5 SATA Pb
Post by: Gert on April 16, 2007, 07:22:26 AM

Quote from: "Gert"

I think you can still install RAID5 on 3 disks with the nospare option. Can anyone confirm this? I will test it tomorrow.

Does not work. How about installing with 4 drives and removing the spare after installation?

Title: RAID5 SATA Pb
Post by: Gert on April 16, 2007, 07:23:02 AM

Quote from: "Gert"

I think you can still install RAID5 on 3 disks with the nospare option. Can anyone confirm this? I will test it tomorrow.

Does not work. How about installing with 4 drives and removing the spare after installation?