I have Bl465 C g1 server with only two hard drive slots which are currently occupied with 72GB disks (physical) which are at raid 1 level. This contians the OS partition aswell now I need to replace t

I have Bl465 C g1 server with only two hard drive slots which are currently occupied with 72GB disks (physical) which are at raid 1 level. This contians the OS partition aswell now I need to replace the disks with 300GB SAS disk with 15000rpm speed.

Please let me know the possiblites how do i keep my server alive with out reinstallation.
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How was the RAID 1 established: Software (via the O/S) or Hardware (via a dedicated RAID controller? If software RAID, you best bet would be to boot into Ghost/Drive Image Pro/Altiris/whatever you have available and image the 72GB partition onto the 300GB partition.

If you have a dedicated controller, the controller probably came with (or has available) software which will facilitate the transfer.

There are other possibilities, of course, but those are the easiest…

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Considering that you used the hardware array (the onboard array controller of your HP Blade) you can do the replacement (and partition expansion after that) via ACU (Array Configuration Utility).

Follow the instruction of this HP's guide (go to page 29, Upgrade hard disk capacity paragraph). Do a full backup first.

This is a nice built in capeability swap one drive with a larger drive, wait for the rebuild to complete then do the second drive. What it does not say is if it uses that full capacity.
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No it does not. In this way you just substitute the 72Gb HDD with the 300Gb HDD. Then you must do the partition expansion (Extend Logical Drive) as described in the HP Array Configuration Utility User Guide (it says so at the end of the paragraph).

Here's the link for it (go at page 24)
Do NOT do a swap->rebuild->swap-> rebuild.

What if the disk you did not swap decides to die during the rebuild?  What if you have an unreadable block?   best and safest way to do this is perform a full bare-metal backup, unplug the original drives, build the new RAIDset, format it, then restore.

Not only is there zero risk of data loss, but this gives you a zero-risk mechanism to test a full bare metal restore.  If the restore fails, you still have your original RAID set which you can pop back in, and then try again.
dlethe you can always restart the system by starting it from the HDD you pulled out (let's say ID1). That's the way hardware arrays function and, trust me, never ever had a single issue (even with "rolling back" with IDs) in 12 years of thousands of implementation of HPs servers (Compaq --> HP DL, Blades, MLs...)
Agreed, but there is still risk of picking up an unreadable block.  Furthermore, when you yank that 2nd disk, the RAID controller will mark it as bad.  It can't tell difference between operator yanking a disk and a failure.  So now you have left controller in a state where you have to manually teach it that the replacement drive is no good.
Plus, none of this does anything for resizing partition or testing a bare metal backup, but odds are good you won't run into hiccups, just not 0%
Marking bad....not for HP :-)
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