CLI Change drive Post: 302583822

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Operating Systems Linux Ubuntu CLI Change drive Post 302583822 by Corona688 on Wednesday 21st of December 2011 10:14:41 AM

12-21-2011

Registered User

Quote:

Originally Posted by Royalist

Please -- I cannot find how to change in terminal from e.g. sda1 to sda2 or to sdb*

UNIX partitions don't work that way. You don't use drive letters or device names to access files. In UNIX, files are all organized as one great big tree. Instead of drive letters, UNIX uses directories as mount points. This lets you put partitions on whatever folder you want. This is even customizable.

This is what the file tree on my system looks like:

Code:

$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sdc3            1008M  318M  639M  34% /
udev                   10M  284K  9.8M   3% /dev
/dev/sdc5              20G   11G  8.4G  56% /home
/dev/sdc6             9.9G  4.6G  4.9G  49% /usr
/dev/sdc7             5.6G  1.6G  3.9G  29% /var
/dev/sdc8             116G  5.1G  111G   5% /var/lib/mysql
shm                   948M     0  948M   0% /dev/shm
/dev/md125            394G  351G   24G  94% /opt
/dev/md126            1.5T  1.4T  106G  93% /opt/disk-images
$

'udev' and 'shm' are special kernel filesystems which you can ignore for now.

If I created a file inside /, or /tmp/, or /sbin/, or /etc/ -- nowhere inside any of the other folders listed -- the file would end up inside /dev/sdc3.

If I created a file in /home/username/, it would end up in /dev/sdc5.

My /var/ partition ended up not being large enough to hold our database, so I grafted another partition onto /var/lib/mysql for it to work inside.

Which partitions go where is traditionally controlled by lines in the /etc/fstab file, but various systems may handle it different ways.

Last edited by Corona688; 12-21-2011 at 11:22 AM..

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LEARN ABOUT OPENSOLARIS

volcheck

volcheck(1)							   User Commands						       volcheck(1)

NAME

       volcheck - checks for media in a drive and by default checks all floppy media

SYNOPSIS

       volcheck [-v] [-i secs] [-t secs] pathname

DESCRIPTION

       The  volcheck  utility tells volume management to look at each dev/pathname in sequence and determine if new media has been inserted in the
       drive.

       The default action is to volcheck all checkable media managed by volume management.

OPTIONS

       The following options are supported:

       -i secs	  Set the frequency of device checking to secs seconds.  The default is 2 seconds.  The minimum frequency is 1 second.

       -t secs	  Check the named device(s) for the next secs seconds.	The maximum number of seconds allowed is 28800, which is 8 hours. The fre-
		  quency of checking is specified by -i. There is no default total time.

       -v	  Verbose.

OPERANDS

       The following operands are supported:

       pathname    The path name of a media device.

EXAMPLES

       Example 1 A sample of the volcheck command.

       The following example

		 example% volcheck -v /dev/diskette
		 /dev/diskette has media

       asks volume management to examine the floppy drive for new media.

       The following example

		 example% volcheck -i 2 -t 600 /dev/diskette1 &

       asks volume management if there is a floppy in the floppy drive every 2 seconds for 600 seconds (10 minutes).

FILES

       /dev/volctl    volume management control port

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWvolu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       eject(1), rmmount(1M), attributes(5)

WARNINGS

       Due  to a hardware limitation in many floppy drives, the act of checking for media causes mechanical action in the floppy drive.   Continu-
       ous polling of the floppy drive will cause the drive to wear out. It is recommended that polling the drive only be performed during periods
       of high use.

SunOS 5.11							    28 Feb 2007 						       volcheck(1)