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Full Discussion: Partition management: lvm? fdisk? parted? (on RAID)
Special Forums Hardware Filesystems, Disks and Memory Partition management: lvm? fdisk? parted? (on RAID) Post 302417800 by builder88 on Friday 30th of April 2010 06:52:02 PM
Old 04-30-2010
Partition management: lvm? fdisk? parted? (on RAID)
Hello,

I have a RHEL system with two 500GB hard drives in RAID 1 (I think hardware, but not 100% certain - any way to tell?).

It looks like it was just set up in default configuration with a small boot partition and one huge partition for the rest, which composes a LVM volume.

I want to break that partition up into at least two separate ones. What I am wondering is:

* What's the difference between using fdisk and parted? Any reason to use one over the other?

* Should I just use lvm instead to shrink the current volume and create a second one? Is there a down-side to use logical volumes without creating a physical partition with fdisk/parted?

* Being that there are already two disks in RAID 1 configuration, does partitioning with lvm or fdisk/parted transparently propagate to the mirror disk or do I need to do something to partition BOTH drives?

Thanks in advance!!
 

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LEARN ABOUT OPENSOLARIS

dpt

dpt(7D) 							      Devices								   dpt(7D)

NAME

       dpt - DPT ServeRAID IV SCSI host bus adapter and RAID adapter driver

DESCRIPTION

       The dpt driver is a driver for the DPT (Distributed Processing Technology) family of SmartRAID IV SCSI HBA and RAID adapters. The following
       HBA adapters are supported: PM2024, PM2044UW, PM2044W, PM2124, PM2124W, PM2144UW, and PM2144W.

       The following RAID adapters are supported: PM3224, PM3224W, PM3334UW, and PM3334W.

PRECONFIGURATION

	   o	  DPT PM3224 only: Only EPROM 7A and later versions are supported.

	   o	  DPT PM2024 and PM2124 only: Only EPROM 6D4 and later versions are supported.

	   o	  Use adapters with SmartROM version 3.B or later versions only.

	   o	  Be sure that the controller board is installed in a PCI bus-mastering slot.

	   o	  Disable PCI parity checking if your firmware version is earlier than version 7A, if your system memory is ECC, or if your system
		  does not check parity.

   Known Problems and Limitations
       During  system boot, a message may be displayed saying a DPT controller driver cannot be installed. This message indicates that the mother-
       board installed in your system may contain ECC memory or may not check parity. If you see this message is  displayed,  disable  PCI  parity
       checking.

   Supported Settings
	   o	  I/O Address: Auto

CONFIGURATION

       Auto-configuration  code  determines whether the adapter is present at the configured address and what types of devices are attached to it.
       The DPT ServeRAID is primarily used as a disk array (system drive) controller.

       To configure the attached disk arrays, you must configure the controller (using the configuration utilities provided by the hardware  manu-
       facturer)  before  you  boot  the Solaris operating environment. You use the configuration utilities to set RAID levels, stripe parameters,
       cache mechanisms and perform other functions. For more information, see the user manual supplied with your hardware.

FILES

       /kernel/drv/dpt.conf	dpt configuration file

       /dev/dsk/cndn[s|p]n	block device

       /dev/rdsk/cndn[s|p]n	raw device where:

       cn			controller n

       dn			LUN n (0-7)

       sn			UNIX system slice n (0-15)

       pn			fdisk(1M) partition(0)

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------------------------------------+
       |ATTRIBUTE TYPE		      ATTRIBUTE VALUE		   |
       |Architecture		      x86			   |
       +-----------------------------------------------------------+

SEE ALSO

       fdisk(1M), attributes(5), cmdk(7D)

SunOS 5.11							 27 November 2000							   dpt(7D)
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