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sallytron

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19 years ago

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sallytron

2 Posts

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7808

May 25th, 2007 19:00

how to remove physical drive from logical drive

I have a Poweredge 4300 (HSF73) on which I did a new installation of Windows Server 2003, which went well and I'm not using it for anything yet. Problem is I didn't have the partitioning the way I wanted it before installing the OS, so I'm looking for advice on how to make changes now.
It has 3 physical 9GB drives, on the PERC II controller doing RAID 5, with 1 Logical drive.
The primary partition is only 2 GB, and the balance 15 GB is in a second partition. This is a hangover from how it was partitioned when it was running NT 4.0 OS.
I want to remove 1 physical drive so I can use it in another machine because I don't need much disk in this one.
With the remaining 2 physical drives, I want to just have them mirrored (RAID 1), with a 4GB partition for the OS and the balance of space in a second partition.
I'm not sure how to proceed.
It's fine if I have to change the RAID configuration and partitions and then reinstall the OS, because I'm not using it yet. I'm just not sure what tool to use and I don't want to ruin the server for good.
Would I use the PERC BIOS Configuration Utility?
In there, would I do the "Force Offline" on the third disk, so I could remove it from the array, then which option would I use to change from RAID 5 to RAID 1?
Sorry to be using old stuff!
  • 577

    0

    Posted June 1st, 2007 15:00

    The X300 generation servers were very rock solid.  And there's nothing to "screw up" by reconfiguring the storage array of an unused server.  :)
     
    You can't fail (or force offline) a drive in a 3 drive RAID 5 and reconfigure a RAID 1.  It's not possible mathmatically.  You're trying to take an 18gig array, taking the parity drive offline, and then telling it to make a 9gig mirror.  RAID controllers won't let you reconfigure an existing array down to a size that's smaller than what it originally started with.  It simply has no way to rearrange the storage.....EVEN IF you have very little data on the drive.   
     
    Without a lengthy scsi-raid discussion....just create a new array the way you want it.  Go to CTRL-M, configure, new configuration, tag two drives and make them a RAID 1 mirror.  All done.
     
     
  • sallytron

    2 Posts

    577

    0

    Posted June 1st, 2007 16:00

    Yes. I muddled through it myself a couple days ago and that's exactly what I ended up doing. Glad to know it was the "right" way now. Thanks for your expertise.:smileyhappy: