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Best Case Scenario for RAID 1+0 and adding more drives

Client has HP server that is running Exchange 2007. It has 2 physical drives that are configured as a RAID 1+0 (10) both are 72g Drives. The server is only a year old and I am wanting to increase his space. With this configuration because I see that it only lists 1 logical drive but 2 physical drives when I put in the other drives what should take place?
Hp configuration is loaded.
What space can I increase to is it (smallest drive)*(number of drives)/2?
I have 8 more slots for HD's What would you do?
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seanlewisokc
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seanlewisokc
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1 Solution
 
MikealclCommented:
You mean its configured as a Mirror right?  RAID 1 not 1+0??

You can't do raid 10 with 2 drives.

I would image the server, add the new disks, reconfigure the array in whatever mode you want, and reinstall the image.

Else you could add 6 disks, configure the array, and move the exchange database from the c: to the new partition.


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seanlewisokcAuthor Commented:
The HP software shows configuration as RAID 1+0 1 logical Drive 2 Physical drives. SAS ARRAY A
Controller  Smart Array E200  
Bus Interface  PCI Express
Controller Location  Slot 3
 
RAID 6 (ADG) status  Disabled  
Hardware Revision  A
Firmware Version  1.20
Rebuild Priority  Low  
Expand Priority  Low  
Current Surface Scan Delay  15 sec
Number of Arrays  1
Number of Logical Drives  1
Number of Physical Drives  2
Physical Drives Attached to Port 1I Box 1 : Bay 1, 72 GB (SAS)
Box 1 : Bay 2, 72 GB (SAS)
 
All Physical Drives Assigned  Yes  
 
Array Accelerator  
Present  Yes  
Cache Status  Enabled  
Accelerator Ratio  100% Read /0% Write  
Total Memory on Controller  64 MB  
Battery Pack Count  0
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MikealclCommented:
Well it is lying to you.    It's only doing RAID 1.  That's why you see a acceleration ration for reads and not writes.

http://en.wikipedia.org/wiki/RAID


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MikealclCommented:
IF that really is RAID 10 mode acting as a mirror I wonder if you can add 2 more 72g's and the stripe half of the 1+0 will enable.


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seanlewisokcAuthor Commented:
That puts it in the corner of not what ifs but what to do's. I need a solution if anyone has ran across this with having to tear anything down. My worst case scenario is I shift Exchange off to remoteexchange and rebuild. Im not onsite at the time and need a solutions before I roll out 500 miles away.  
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aleghartCommented:
RAID 1+0 is probably from the user selecting auto-config routine instead of configuring manually.  My HP 6i shows the same.

Can you confirm that this is mirroring?  For instance 2x72GB drives should show ~70GB of space, not 140GB.

If this is running as a mirror, you can

Run and confirm/test a full-system backup.
Remove one 72GB drive, replace with larger (say, 300GB).
Let the mirror rebuild.

Run and confirm/test a full-system backup.
Replace other 72GB drive.
Let the mirror rebuild.

Use software such as Partition Manager (http://www.partition-manager.com) to expand the partition to consume more of the new physical drive.

First step, of course, would be to backup, then install partition management software.

I have performed this a few times on RAID1 and RAID5 volumes.  Dell, HP, and generic servers.
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seanlewisokcAuthor Commented:
Aleghart - I like your proposal and the fact you have same equipment and issue it seems like.
Yes I can confirm that max space is 68g'ish. What if I just add the drives to the server? I.E. I put 3 drives in the server array those in a RAID 5 146/146/146 = Total 292 for D: and move the Exchange DB over to that? or am I shooting too far off.
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aleghartCommented:
If you have the space, you can create another array (RAID1 or RAID5) for a "D: drive" for data.

BTW, you don't have to mount it as a letter.  You can mount as an NTFS partition if that makes less hassle for shortcuts and existing scripts/automation, etc.

For instance, you can format the new volume as C:\DATA  or D:\  
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seanlewisokcAuthor Commented:
There are 8 more bays for the hd's.
Does anything need to be prepped for the new array?
I think going with separate volume that way anyone comes in behind me can see a clear cut reasoning for the RAID 1+0 on the other set of drives.
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seanlewisokcAuthor Commented:
Or Raid 5?
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easyDKCommented:
RAID5 prefferably not, as it has slower access time than RAID1 or 10.
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seanlewisokcAuthor Commented:
I will make this my solution that i take to the client.
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aleghartCommented:
>RAID5 prefferably not, as it has slower access time than RAID1 or 10.

HP's entry-level RAID controllers suffer from the "write-hole" on RAID5.  High-end controllers, like those from 3Ware offer writes upwards of 100+MB/s, so not an issue.

RAID5 should be used for space (versus speed) and expandability a single drive at a time.  For general office use, I've never had a problem with speed.  That includes GroupWise, Exhange, BES, Sharepoint, MRP & ERP database systems including MS-SQL...for 20-30+ user offices.  RAID 5 still has relevant use, contrary to new opinion that all things should be fast, fast, fast, regardless of application.

In a high-volume environment (electronic pre-press) I still had a RAID5, albeit with redundant controllers.  Speed was noticeably impacted by the array on file transfer up to the server and copies from folder to folder.  But the bigger bottleneck was the actual processing time by the software.  The drives could keep up with the software at the time.
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seanlewisokcAuthor Commented:
I appreciate the info. I have used RAID 5 several times for storage arrays. RAID 10 was first time I have ever seen this configuration with 2 drives.
Plan is to create another RAID 10 with 4-72g HP drives That gives exchange lots of growth for 2 years until upgrade at 144g for a D: Data drive for edb logs and exchange files in general. I will update you guys with end result and issues that I had and how much time it took. So future people can see something all the way through. That is the only part I hate about forums with an answer that may or may not have worked is if it did you never hear the end result for the most part.
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