change harddisk in raid 1

Hi Experts,

I have a server HP D360 G5.This server has 2 disks in raid 1, each disk has 146GB.
Now I want to change the disk to get more space.

Is it possible to unplug one disk from the raid and put a new 600GB disk in ?
Then I wait for the synchronisation and do the second disk as well ?

Please advise me the best way.
Eprs_AdminSystem ArchitectAsked:
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kadafitcdConnect With a Mentor Commented:
The risk is minimal when you consider that you aren't destroying any data on the disk you remove first.  It's an entire backup of everything if somethings goes wrong in synching the first drive.  

Firmware shouldn't be a problem on the drives.  All should go well.

The above is stated as you have a backup.  But in reality even if you have a RAID 1 you should always keep another backup source on an external drive or to a cloud storage source.
pjamConnect With a Mentor Commented:
No that will not work I am afraid.  The new disk will be used as 146GB.
You will need to copy data off and purchase a second 600GB if you still want Raid 1.
You can however use the new HD as a second volume with 600GB.

If you have another slot for a third disk that is.  I am guessing no with the DL 360
kadafitcdConnect With a Mentor Commented:
Doing it the way you intend will offer the most uptime of your server.  However you will have to extend the partition to utilize the new space, if allowed by Windows Disk Management it will be the easiest way to do so.  If it's not allowed you will have to use a third party partition management application to accomplish your goal.
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Eprs_AdminSystem ArchitectAuthor Commented:
I have 4 slots in this server.
But I also want to increase the 146GB Raid1 Disk.
I know the new disk has just 146GB not 600GB.
But when I put the second in, then it must work with 600GB or not ?

What is the easiest way to change disks in a Raid 1 ?
Eprs_AdminSystem ArchitectAuthor Commented:
yes this is the point, I need the uptime of the server.
Can I have problems with the firmware of the old disk and the new disk ?
DavidConnect With a Mentor PresidentCommented:
Don't do it.  This puts your data at risk.  You already know you use RAID1 to protect against data loss in event of a unreadable block or disk failure ... so now you want to turn it off??

One bad block and you lose data. You might want to refresh yourself with Murphy's laws ;)

Do it the right way, take a full backup, swap both drives, initialize, then restore.  All the decent backup products will resize the partition safely.
pjamConnect With a Mentor Commented:
RAID will synch the new 600GB as a 146GB.  When you put the second one in it will do the same.  If you have 4 slots, put the 2 600GB in there for data as RAID1and use the 146GB RAID1 for OS
Eprs_AdminSystem ArchitectAuthor Commented:
somebody sasys you can do it and somebody not.
When I do this with a backup, then I have to change the disks and install Windows and put the agent on it and then I can restore. This takes a lot of time.

When I change disks, I know the risk, the data is running on one single disk.
But is it working ? What about the differnet firmware on it, can it be a problem ?

Now I just want to look for the C partition to increase from 146GB to 600GB.
andyalderConnect With a Mentor Commented:
>RAID will synch the new 600GB as a 146GB.  When you put the second one in it will do the same.

No it won't, you'll see the whole 600GB after replacing both one at a time, at least in the ACU. You can then extend the logical disk so the OS sees 600GB. You're probably thinking of DELL PERCs.

The method is supported and works, you do require a cache battery for logical disk extension (you can check "more info" with controller highlighted and there is a small risk that rebuild will fail as dlethe points out but there is always that risk with RAID. Normal thing to do is backup, then try the swapping one-by-one method and in the unlikely event of it not working then you have to restore. Normally works without downtime. You can improve the chances of it working by checking the ADU report to see if there are "read errors hard" on either of the current disks.

HP even support splitting the mirror to create an in-hand disk backup - see

Note that breaking the mirror live leaves you with a 'crashed' OS on the disk you take out, recommended is to shut down, take one out, boot up, fit larger disk.
andyalderConnect With a Mentor Commented:
>somebody sasys you can do it and somebody not.

You now have 2 vs 1 and I'm master ASE in StorageWorks plus ASE in ProLiants, but it will not work fully without the cache battery since you won't be able to extend the logical disk.
Eprs_AdminSystem ArchitectAuthor Commented:
ok thanks a lot to all.
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