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RAID 5 Configure

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RAID 5 Configure - 31.Oct.2006 4:59:46 PM   
yguelce

 

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Joined: 24.Oct.2006
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We're installing a cluster server configuration for MS Exchange 2003(Active/Passive). We purchased HP DL380 G4 w/ 4x 146GB drives. Any recommendation how I should setup the raid? Let me be more clear. I'll be setting a raid 5, but should i setup the raid 5 with 3 drives and one hot-spare or raid 5 with 4 drives?  Please keep in mind all the Storage groups will be on a SAN configuration and not on the server.

With that said, what would you guys recommend for the system volume size and the program files?

Thanks


Post #: 1
RE: RAID 5 Configure - 31.Oct.2006 11:31:41 PM   
uemurad

 

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There isn't a single answer that will work for all situations.  The trade-off is higher capacity versus an extra level of protection against shutdown or corruption.  Remember that RAID5 protects against a single drive failure, and that the second failure will render the partition unusable.  Having a hot spare means that three drives have be failed simultaneously to cause the same situation.  Again - it's your call.  You also gain slightly in performance with more active drives as the load is spread out.

What will this RAID5 do?  Is this the boot drive?  What else?  The log files?
You may even consider two RAID1 partitions.

_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to yguelce)
Post #: 2
RE: RAID 5 Configure - 1.Nov.2006 2:22:38 AM   
elmajdal

 

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Joined: 15.Jan.2006
From: Lebanese in Kuwait
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We have the same server u have but with 4 x 70 GB SCSI harddisks.
we do have also 2 nodes exchange server in A/P mode.

We setup the 4 HDs to be 2 x RAID 1+0

the first RAID 1+0 is the OS and the 2nd RAID 1+0 for the logs.

and as u said , all the storage groups are located into the shared cluster.

_____________________________

Tarek Majdalani

Windows Expert - IT Pro MVP
Facebook : https://www.facebook.com/ElMajdal.Net

(in reply to uemurad)
Post #: 3
RE: RAID 5 Configure - 1.Nov.2006 11:08:19 AM   
manish68

 

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Hi,

my 2 cents, if you are using one of the high end controller, HP uses ADG as a standard which provides protection agains 2 Drive failure if a RAID5 is setup using 4 or more drives, and single if using 3 Drives and use the 4th a hot spare.


(in reply to elmajdal)
Post #: 4
RE: RAID 5 Configure - 2.Nov.2006 9:31:35 AM   
yguelce

 

Posts: 86
Joined: 24.Oct.2006
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Godly, I love this site; you guys are all over it!

Yes, you're absolutely correct uemurad. There're many correct answers for my question. However, i'm seeking suggestions and best practice.

And to be close and actuate, elmajdal offered the solution we're considering to implement. I find a few articles from MSExchange.org regarding this setup and they're suggesting implementing 2x raid 1+0.

Nonetheless, elmajdal, are you referring to the transaction logs on the second raid 1+0 configure or page files?

How large do you guys suggest the OS volume should be, and should I partition the first raid for OS and Program Files or the second raid for Page files and Program Files and leave the OS on it own raid?

Raid1:
     Vol1: OS
     Vol2: Program Files
Raid2:
     Vol1: Page Files

OR

Raid1:
    Vol1: OS
Raid2:
    Vol1: Page Files
    Vol2: Program Files

Thanks-
-YG


(in reply to manish68)
Post #: 5
RE: RAID 5 Configure - 2.Nov.2006 3:17:43 PM   
ardzZz

 

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From: Silicon Valley
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It has been my experience that RAID 5 w/ Hot Spare will benefit you when you most need it.  Even brand new Dell servers have that possibility of losing a drive.
A thought that you'd much prefer not bother you.

However else you configure the rest of the drives, as mentioned by others, is solely up to your needs.


_____________________________

// somewhere between ...
novice
... and genius //

(in reply to yguelce)
Post #: 6
RE: RAID 5 Configure - 3.Nov.2006 10:20:52 AM   
elmajdal

 

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Joined: 15.Jan.2006
From: Lebanese in Kuwait
Status: offline
quote:

Nonetheless, elmajdal, are you referring to the transaction logs on the second raid 1+0 configure or page files?


Transaction logs

quote:

How large do you guys suggest the OS volume should be, and should I partition the first raid for OS and Program Files or the second raid for Page files and Program Files and leave the OS on it own raid?



1st Raid: 1+0 :  70 GB
OS + Program Files

2nd Raid: 1+0:  70 GB
Transaction Logs

3rd Raid: 5 : 5x70 GB
Shared Cluster for both nodes

In my setup, i didnt change the page files location, they are still along with the OS.
Later if you found there are any problems , ofcourse u can change its location at any time.

_____________________________

Tarek Majdalani

Windows Expert - IT Pro MVP
Facebook : https://www.facebook.com/ElMajdal.Net

(in reply to yguelce)
Post #: 7
RE: RAID 5 Configure - 3.Nov.2006 10:29:29 AM   
yguelce

 

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Joined: 24.Oct.2006
Status: offline
I started installing the server already.

Configuration:
A Raid 1+0: OS and Program Files (Two separate volumes)
B Raid 1+0: Page Files

Although the servers are clustered, you have a transactional log running on each individual server or do this transactional log located on the SAN?
Thanks,

(in reply to elmajdal)
Post #: 8

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