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Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

Philippe BOUSSAROQUE
Occasional Visitor

Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

OS: Windows 2000 server SP4
Our system has three SCSI 18.2GB Disks
The Raid controler is a Smart Array 5i
All Those Three disks have been integrated in one logical unit Raid 0 mode
We download RAID configuration utility version 7.15.19.0
We try to use migration option to migrate to Raid 5
The configurator offer only Raid 0 option

1- Is it possible to migrate from Raid 0 to Raid 5
2- What is the best solution to do it, without re-installing the entire system

MERCI BEAUCOUP

Philippe

----------------------------------
Contrôleur Contrôleur Smart Array 5i
Interface de bus PCI 64 bits
Emplacement du contrôleur Incorporé

Révision matériel B
Version du microprogramme 2.58
Priorité de reconstruction Bas
Priorité d'extension Bas
Délai de balayage de surface actuel 15 sec
Nombre de modules RAID 1
Nombre d'unités logiques 1
Nombre de disques physiques 3
Disques physiques connectés sur le port 2 ID SCSI 0, 18.2 GB (SCSI parallèle)
ID SCSI 1, 18.2 GB (SCSI parallèle)
ID SCSI 2, 18.2 GB (SCSI parallèle)

Tous les disques physiques sont attribués Oui

Accélération RAID
Présent Oui
État du cache Activé
Pourcentage d'accélération 100% Lecture/0% Écriture
Taille du cache en lecture 16 MB
Taille du cache en écriture 0
Décompte des blocs batteries 0
------------------------------

Unité logique 1
Contrôleur Contrôleur Smart Array 5i
Interface de bus PCI 64 bits
Emplacement du contrôleur Incorporé

Module RAID A
Type du module SCSI parallèle
Nombre d'unités logiques 1

Unité logique 1
Taille 52079 MB
tolérance de failles RAID 0
Têtes 255
Secteurs par piste 32
Cylindres 13071
Taille de stripe 64 KB
État OK
Disques physiques défaillant
9 REPLIES
Uwe Zessin
Honored Contributor

Re: Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

I think you first have to add another physical disk drive to your disk array to gain space for the RAID-5 parity data.
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Prashant (I am Back)
Honored Contributor

Re: Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

HI,

Yes add more physical disk on server the use ACU on the server then go ahead with addign more disk then migration. Better is to go through user manual of ACU for more details.
http://h18000.www1.hp.com/products/servers/proliantstorage/software-management/acumatrix/index.html

Do check the attachement also for the same.

Regards,
Prashant S.
Nothing is impossible
Seth Parker
Trusted Contributor

Re: Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

Like Uwe and Prashant say, you need to add at least one more disk to the array before you can convert to RAID 5. This is not for space, it's just because 3 physical disks are the minimum you can have in a RAID 5 configuration. If you add 2 more disks, you can have RAID 5 with an online spare (which isn't used at all unless one of the other disks fails). Just add the new disk(s) to the current logical array and you should be able to convert it from RAID 0 to RAID 5.

The only other thing to check is that you have the most recent versions of the array driver for Windows, the ACU and the firmware for the adapter. It looks like you're ok on the firmware an ACU.

Regards,
Seth
Philippe BOUSSAROQUE
Occasional Visitor

Re: Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

Thanks all for replying
1st- As there are already 3 disk sin the array , why one fourth one ??
2nd- May we have to add a DD of same type or size or can we just add an 80GB IDE DD for migration and remove it from array after??

MERCI BEAUCOUP for help
Uwe Zessin
Honored Contributor

Re: Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

Hello Philippe,

I assume your (RAID-0) logical disk is currently taking up all space in the disk array? Then you need more space in the disk array for the RAID-5 parity data. RAID-0 is just striping without any redundancy.

You can add a SCSI disk with a higher capacity (e.g. 36 GigaBytes) to the disk array, but the SmartArray controller uses fixed formulars and the usable size is limited by the smallest disk in an array.

I don't think you can add an IDE disk to the disk array, if that was the question, because all disks must be connected to the controller's SCSI busses.


What you might be able to do is:
- copy all data from the (RAID-0) logical disk to the IDE disk

- delete the (RAID-0) logical disk

- create a new logical disk in RAID-5

!Please note that the new logical disk will only be about 36 GigaBytes in size, not 3*18!

- copy the data back from the IDE disk to the new (RAID-5) logical disk
.
Philippe BOUSSAROQUE
Occasional Visitor

Re: Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

That is the answer i was afraid to hear.
It means re installing the all system

To avoid IT, can i make a clone of the logical disks (ie c: and d:) on my ide disk , format disks , rebuilds array in raid 5, build c: and d; logical disk and back from clone(s)

MERCI BEAUCOUP

Philippe
e4services
Honored Contributor

Re: Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

That you CAN do. But will you have enough space? You will have only half the space when finished.
Hot Swap Hard Drives
Uwe Zessin
Honored Contributor

Re: Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

He will keep about 66% (2/3) of the former space.
.
Pineda
Occasional Visitor

Re: Migrating from Raid 0 to Raid 5 on ML370 G2 Smart Array 5I How??

Hi !
at the end of your first text, there's:
Disques physiques défaillant

are there some "Disques physiques défaillant" ?
i suppose not.

the last solution is the good one, making a clone (with norton ghost or powerquest drive image)of the whole system.
Like this, you won't have to install it again, and ide device is cheap.
You can also use a dos bootable floppy with network support to clone the partitions to any place of your LAN to avoid buying an ide device.
The remaining problem is th one of the space left after raid5 takes space for parity, approximately 33% of total space:52079Mo=>34727Mo .
you see where the problem