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3 Replies Latest reply: Jan 23, 2013 5:01 AM by Dude! RSS

Linux Drives and Partitions

misterimran Newbie
Currently Being Moderated
Dear All,

I have to install Oracle on a Linux Box.

This is My OS:
*[root@orabackup ~]# cat /etc/redhat-release *
Red Hat Enterprise Linux Server release 5.5 (Tikanga)

Physically I have 3 disks attach to this machine 143 GB each.

I am not sure if there is any kind of mirroring or RAID in this machine.

When I run
*[root@orabackup ~]# df -h*
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
*256G* 172G 71G 71% /
/dev/cciss/c0d0p1 99M 13M 82M 14% /boot
tmpfs *4.0G* 2.1G 1.9G 52% /dev/shm

When i run

*[root@orabackup ~]# fdisk -l*

Disk /dev/cciss/c0d0: *293.5 GB* , 293564211200 bytes
255 heads, 63 sectors/track, 35690 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/cciss/c0d0p1 * 1 13 104391 83 Linux
/dev/cciss/c0d0p2 14 35690 286575502+ 8e Linux LVM

*[root@orabackup ~]# lvmdiskscan* I get
/dev/ramdisk [       16.00 MB]
/dev/root [      263.53 GB]
/dev/ram [       16.00 MB]
/dev/cciss/c0d0p1 [      101.94 MB]
/dev/VolGroup00/LogVol01 [        9.75 GB]
/dev/ram2 [       16.00 MB]
/dev/cciss/c0d0p2 [      273.30 GB] LVM physical volume
/dev/ram3 [       16.00 MB]
/dev/ram4 [       16.00 MB]
/dev/ram5 [       16.00 MB]
/dev/ram6 [       16.00 MB]
/dev/ram7 [       16.00 MB]
/dev/ram8 [       16.00 MB]
/dev/ram9 [       16.00 MB]
/dev/ram10 [       16.00 MB]
/dev/ram11 [       16.00 MB]
/dev/ram12 [       16.00 MB]
/dev/ram13 [       16.00 MB]
/dev/ram14 [       16.00 MB]
/dev/ram15 [       16.00 MB]
3 disks
16 partitions
0 LVM physical volume whole disks


Now total disk space shown in any of the command is not more than *293 GB* MAX. How can i find the other disk space? Like total physical disk are *143*3*

How to check that the rest disk space is either not mount, or doesn't have any file system on it, or it is used in the raid or mirroring.

I am very confused regarding this. Kindly help in details and If you require the result of any command please let me know.

Thanks, Imran
  • 1. Re: Linux Drives and Partitions
    BIJ001 Explorer
    Currently Being Moderated
    Physically I have 3 disks attach to this machine 143 GB each.
    How much memory is a GB (in the above sense)?
    Maybe the difference is not that much if taken into consideration the 1000 vs 1024 issue and the file system etc. overhead.

    http://en.wikipedia.org/wiki/Gigabyte
  • 2. Re: Linux Drives and Partitions
    misterimran Newbie
    Currently Being Moderated
    Thanks for the reply. But my assumption is that one disk is not shown by any of the command and maybe it requires formatting or something.
  • 3. Re: Linux Drives and Partitions
    Dude! Guru
    Currently Being Moderated
    /dev/cciss is typical for HP Smart Array RAID controllers. You will need to enter the the controller setup at system start up and check your setup. There is usually a message printed how to enter the controller BIOS. Usable disk space after formatting a drive is generally lower than the capacity of the drive, usually the larger the partition, the higher the value that is "wasted".

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