help about create a big file and select right partition Post: 302691157

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Top Forums Shell Programming and Scripting help about create a big file and select right partition Post 302691157 by yanglei_fage on Friday 24th of August 2012 02:40:41 AM

08-24-2012

Registered User

help about create a big file and select right partition

I want create a 40G file one one disk if the disk free space is more than 45G

Code:

[root@localhost ~]# fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c9518

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1306    10485760   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2            1306        2612    10487690+  83  Linux
Partition 2 does not end on cylinder boundary.
/dev/sda3            2612        3917    10485760   83  Linux
Partition 3 does not end on cylinder boundary.
/dev/sda4            3917       60801   456923798    5  Extended
/dev/sda5            3917       10444    52431164   83  Linux

Note some of them has been auto mounted

Code:

[root@localhost ~]# df 
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1             10321208   6479336   3317584  67% /
tmpfs                 32958812       100  32958712   1% /dev/shm
/dev/sr0               3592530   3592530         0 100% /media/RHEL_6.3 x86_64 Disc 1
/dev/sda5             51608052   6378976  42607520  14% /mnt2

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LEARN ABOUT SUNOS

cmdk

cmdk(7D)							      Devices								  cmdk(7D)

NAME

       cmdk - common disk driver

SYNOPSIS

       cmdk@target, lun : [ partition | slice ]

DESCRIPTION

       The  cmdk  device  driver  is  a  common interface to various disk devices. The driver supports magnetic fixed disks and magnetic removable
       disks.

       The block-files access the disk using the system's normal buffering mechanism and are read and written  without	regard	to  physical  disk
       records. There is also a "raw" interface that provides for direct transmission between the disk and the user's read or write buffer. A sin-
       gle read or write call usually results in one I/O operation; raw I/O is therefore considerably more efficient when many bytes are transmit-
       ted. The names of the block files are found in /dev/dsk; the names of the raw files are found in /dev/rdsk.

       I/O  requests  to the magnetic disk must have an offset and transfer length that is a multiple of 512 bytes or the driver returns an EINVAL
       error.

       Slice 0 is normally used for the root file system on a disk, slice 1 as a paging area (for example, swap), and slice 2 for backing  up  the
       entire fdisk partition for Solaris software. Other slices may be used for usr file systems or system reserved area.

       Fdisk partition 0 is to access the entire disk and is generally used by the fdisk(1M) program.

FILES

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

       /dev/rdsk/cndn[s|p]n    raw device (IDE)

			       where:

			       cn	controller n

			       dn	lun n (0-7)

			       sn	UNIX system slice n (0-15)

			       pn	fdisk partition(0)

       /kernel/drv/cmdk        32-bit kernel module.

       /kernel/drv/amd64/cmdk  64-bit kernel module.

ATTRIBUTES

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

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

SEE ALSO

       fdisk(1M), mount(1M), lseek(2), read(2), write(2), readdir(3C), scsi(4), vfstab(4), attributes(5), dkio(7I)

SunOS 5.10							    9 Oct 2004								  cmdk(7D)

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