Resize partition and file system - Revision history

Ted at 18:05, 20 December 2017

2017-12-20T18:05:42Z

Ted at 17:47, 20 December 2017

2017-12-20T17:47:55Z

Ted at 17:22, 20 December 2017

2017-12-20T17:22:23Z

Ted at 17:59, 21 November 2017

2017-11-21T17:59:27Z

Ted: 2017-11-17 - Tuesday Ted correcting an in-wiki link. Have used the linking syntax for a while but yet learning the nuances of internal versus external links, and also links which point to a named section within a wiki page - TMH

2017-11-21T17:25:57Z

2017-11-17 - Tuesday Ted correcting an in-wiki link. Have used the linking syntax for a while but yet learning the nuances of internal versus external links, and also links which point to a named section within a wiki page - TMH

Ted: 2017-11-21 - Tuesday Ted adding top-of-page navigation menu. This, and auto-numbering of figures or pre-formatted blocks of text between HTML

 tags on Ted's to-add and wish-list of Mediawiki improvements - TMH

2017-11-21T17:24:31Z

2017-11-21 - Tuesday Ted adding top-of-page navigation menu. This, and auto-numbering of figures or pre-formatted blocks of text between HTML <pre> tags on Ted's to-add and wish-list of Mediawiki improvements - TMH

Ted: 2017-09-27 WED - Ted recreating or copying yesterday's notes on partition resizing and file system resizing, using cfdisk, e2fsck and resize2fs.

2017-09-27T22:07:17Z

2017-09-27 WED - Ted recreating or copying yesterday's notes on partition resizing and file system resizing, using cfdisk, e2fsck and resize2fs.

New page

To resize both partition and an existing ext4 journaled file system on same partition, Ted uses following three utilities. Arguments to these utilities are specific to a certain disk but steps overall can be generalized:

<pre>

ted@localhost:~$ cfdisk /dev/sdb . . .

cfdisk (util-linux 2.20.1)

Disk Drive: /dev/sdb
Size: 160041885696 bytes, 160.0 GB
Heads: 255 Sectors per Track: 63 Cylinders: 19457

Name Flags Part Type FS Type [Label] Size (MB)
------------------------------------------------------------------------------------------------------------------------
sdb1 Boot Primary ext4 106.93
sdb5 Logical ext4 18498.66
sdb6 Logical Linux 1003.49
sdb7 Logical Linux 10001.95
sdb8 Logical Linux 20003.89
sdb9 Logical Linux 50001.48
sdb10 Logical Linux 60425.52 *

[ Bootable ] [ Delete ] [ Help ] [ Maximize ] [ Print ] [ Quit ] [ Type ]
[ Units ] [ Write ]

Quit program without writing partition table

# Note: for final four partitions in general Ted entered one MB greater than desired to achieve the tens of GB value
# with a little extra showing, due to disk geometry. For example to get at least 10GB, which is 10000MB, Ted entered
# '10002' when cfdisk prompts for size of new partition.

ted@localhost:~$

ted@localhost:~$ sudo e2fsck -f /dev/sdb5
e2fsck 1.42.5 (29-Jul-2012)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/sdb5: 78593/469568 files (0.3% non-contiguous), 1323428/1875580 blocks

ted@localhost:~$ sudo resize2fs /dev/sdb5 4516265
resize2fs 1.42.5 (29-Jul-2012)
Resizing the filesystem on /dev/sdb5 to 4516265 (4k) blocks.
The filesystem on /dev/sdb5 is now 4516265 blocks long.

ted@localhost:~$

</pre>

Ted didn't automatically know that <code>resize2fs</code> needed its final argument, a numeric argument, to express blocks on the given physical disk. There is mention in forums and manual page for this file system resizing utility taking new size in units of GB, MB and other units. Numeric value has to be expressed as an integer, no decimal point. Ted tried using the closest byte-wise integer value he could determine from partition size listed in <code>cfdisk</code>. Utility <code>resize2fs</code> complained of this value being too large -- it is too large when it represents 4k blocks on the disk -- but <code>resize2fs</code> also reports in the same message what number of blocks are available in the partition. In this way Ted found out to give 4516265 as final argument to file system resizing util.

$ sudo resize2fs /dev/sdb5 18498660

In more detail here are the warnings and stop messages from resize utility:

<pre>

$ sudo resize2fs /dev/sdb5 18498660
resize2fs 1.42.5 (29-Jul-2012)
The containing partition (or device) is only 4516265 (4k) blocks.
You requested a new size of 18498660 blocks.

$ sudo resize2fs /dev/sdb5 4516265
resize2fs 1.42.5 (29-Jul-2012)
Please run 'e2fsck -f /dev/sdb5' first.

</pre>

@@ Line 150: / Line 150: @@
 Pass 5: Checking group summary information
 /dev/sdb10: 11/3694592 files (0.0% non-contiguous), 277913/14752316 blocks
+$

← Older revision		Revision as of 17:47, 20 December 2017
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	</pre>		</pre>

		+
		+
		+	<b>Summary</b>
		+
		+	Before running <code>resize2fs</code> on a mounted file system, Ted runs <code>e2fsck</code> file system checking utility first. Then <code>resize2fs</code> can be used to tell us how many 4k or (nk) blocks are present on the block device on which the file system exists. On 2017-12-20 Wednesday, resizing an unused partition which is formatted ext4 and starts out at about 60GB in size:
		+
		+	<pre>
		+
		+	cfdisk (util-linux 2.20.1)
		+
		+	Disk Drive: /dev/sdb
		+	Size: 160041885696 bytes, 160.0 GB
		+	Heads: 255 Sectors per Track: 63 Cylinders: 19457
		+
		+	Name Flags Part Type FS Type [Label] Size (MB)
		+	------------------------------------------------------------------------------------------------------------
		+	sdb1 Boot Primary ext4 106.93
		+	sdb5 Logical ext4 18498.66
		+	sdb6 Logical Linux 1003.49
		+	sdb7 Logical ext4 10001.95
		+	sdb8 Logical ext4 20003.89
		+	sdb9 Logical ext4 50001.48
		+	sdb10 Logical ext4 60425.52 *
		+
		+
		+
		+
		+
		+
		+	[ Bootable ] [ Delete ] [ Help ] [ Maximize ] [ Print ] [ Quit ] [ Type ]
		+	[ Units ] [ Write ]
		+
		+	Quit program without writing partition table
		+
		+
		+	<q> to quit . . .
		+
		+	$ bc
		+	bc 1.06.95
		+	Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
		+	This is free software with ABSOLUTELY NO WARRANTY.
		+	For details type `warranty'.
		+	scale = 3
		+
		+	# figuring size of 60GB partition in 4k blocks:
		+	# cfdisk shows size of 60425.52 MB
		+	60425.52 * 1024
		+	61875732.48
		+	61875732.48 / 4096
		+	15106.380
		+
		+	quit
		+
		+
		+	$ sudo e2fsck -f /dev/sdb10
		+	e2fsck 1.42.12 (29-Aug-2014)
		+	Pass 1: Checking inodes, blocks, and sizes
		+	Pass 2: Checking directory structure
		+	Pass 3: Checking directory connectivity
		+	Pass 4: Checking reference counts
		+	Pass 5: Checking group summary information
		+	/dev/sdb10: 11/3694592 files (0.0% non-contiguous), 277913/14752316 blocks
		+
		+	$
		+
		+
		+
		+	</pre>
		+
		+
		+
		+	<!-- comment -->
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		+	[[#top\|- - - top of page - - -]]
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+[[Main_Page|Wiki Main Page]] | [[User:Ted|User Page of Ted]] | [[User:Ted#.5E_Linux_From_Scratch_.28LFS.29_Project_-_8.1_Release|Linux From Scratch 8.1 Notes]] | [[LFS-book-8p1-notes|Linux From Scratch 8.1 - separate article]]
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-[[Main_Page|Wiki at Neela N]] | [[https://wiki.neelanurseries.com/index.php/User:Ted|User Page of Ted]] | [[User:Ted#.5E_Linux_From_Scratch_.28LFS.29_Project_-_8.1_Release|Linux From Scratch 8.1 Notes]]
+[[Main_Page|Wiki at Neela N]] | [[User:Ted|User Page of Ted]] | [[User:Ted#.5E_Linux_From_Scratch_.28LFS.29_Project_-_8.1_Release|Linux From Scratch 8.1 Notes]]
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← Older revision	Revision as of 17:24, 21 November 2017
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	+	</center>

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