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Re: No success repairing my ext4 file system so far, PLEASE HELP!

From Harry <simonsharry@gmail.com>
Newsgroups comp.os.linux.setup
Subject Re: No success repairing my ext4 file system so far, PLEASE HELP!
Date 2012-04-16 20:19 -0700
Organization http://groups.google.com
Message-ID <16442467.1765.1334632777969.JavaMail.geo-discussion-forums@pbbph3> (permalink)
References (10 earlier) <f7adeb47-6f2a-4f76-98a0-7044ddaffa9c@t2g2000pbg.googlegroups.com> <e3ec60a2-0565-4a44-a9ca-9df28a0cf63f@iu9g2000pbc.googlegroups.com> <297ab19f-6e87-406b-b2b8-715ef4bc1ca3@jx17g2000pbb.googlegroups.com> <85a6427b-2346-45c4-a19e-fb702e728db8@k10g2000pbk.googlegroups.com> <jmhpgo$lc2$1@dont-email.me>

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On Tuesday, April 17, 2012 12:17:52 AM UTC+5:30, Doug Freyburger wrote:
> Harry wrote:
> >
> > I would like to understand LVM and even regular partitioning more
> > thoroughly. Would someone kindly suggest the smallest number of
> > resources (books, links to online articles/tutorials, etc) that would
> > teach me not just the commands but the concepts behind them. Anything
> > and everything above the BIOS and assembly-language I would like to
> > understand. For example, I won't want to understand the boot code in
> > the first 446 bytes of MBR but everything else you guys know about
> > partitioning and LVM.
> 
> Partitioning takes an entire disk and divides it up into one or more
> sub-disks.  Then each sub-disk is used like it's a disk.  You write an
> MBR to make it bootable, a table of the partitions, then the first
> partition starts.  The software reads the partition tables and uses the
> numbers as offsets to calculate block addresses inside each sub-disk. 
> There can be details about primary and extended partitions but that's
> just more of the same.  Those details don't change the simple concepts
> and offset arithmetic of how partitions work.
> 
> Paritions are formatted to contain file systems.  Files live in file
> systems.
> 
> Logical volume manager takes one or more disks and puts them into a pool
> rather like how virtual membery takes one or more memory module and puts
> them together into a pool.  The entire pool is then divided into extents
> rather like how memory is divided into pages.  There's a table of the
> extents early on the disk rather like there's a table of the pages early
> in the main memory.  Then virtual disks are created out of the pool
> (logical volumes) rather like process address spaces are created out of
> the pages in main memory.
> 
> Logical volumes are formatted to contain file systems.  Files live in
> file systems.
> 
> It's the same concept mapped as physical slices one way, as a pool of
> virtual extents the other way.
> 
> The two layers do mix and match - It's possible to put either entire
> drives or partitions into the volume group pool. Both levels work at
> their own level. Your example showed a disk divided into a 250 MB
> partition used to directly contain a file system (probably /boot) and
> the rest in the second partition that formed a volume group.
> 
> Those are the concepts.  Each layer has its own tools.  fdisk for
> partitions.  vgcreate/vgscan/vgextend/vgreduce/vgchange for volume
> groups.  lvcreate and the other lv* cmmands because that's the extra
> layer of virtualization.  Then both types return to the file system
> tools like mkfs.

Thanks. This is definitely a good high-level description. 

On Tuesday, April 17, 2012 12:17:52 AM UTC+5:30, Doug Freyburger wrote:
> Harry wrote:
> >
> > I would like to understand LVM and even regular partitioning more
> > thoroughly. Would someone kindly suggest the smallest number of
> > resources (books, links to online articles/tutorials, etc) that would
> > teach me not just the commands but the concepts behind them. Anything
> > and everything above the BIOS and assembly-language I would like to
> > understand. For example, I won't want to understand the boot code in
> > the first 446 bytes of MBR but everything else you guys know about
> > partitioning and LVM.
> 
> Partitioning takes an entire disk and divides it up into one or more
> sub-disks.  Then each sub-disk is used like it's a disk.  You write an
> MBR to make it bootable, a table of the partitions, then the first
> partition starts.  The software reads the partition tables and uses the
> numbers as offsets to calculate block addresses inside each sub-disk. 
> There can be details about primary and extended partitions but that's
> just more of the same.  Those details don't change the simple concepts
> and offset arithmetic of how partitions work.
> 
> Paritions are formatted to contain file systems.  Files live in file
> systems.
> 
> Logical volume manager takes one or more disks and puts them into a pool
> rather like how virtual membery takes one or more memory module and puts
> them together into a pool.  The entire pool is then divided into extents
> rather like how memory is divided into pages.  There's a table of the
> extents early on the disk rather like there's a table of the pages early
> in the main memory.  Then virtual disks are created out of the pool
> (logical volumes) rather like process address spaces are created out of
> the pages in main memory.
> 
> Logical volumes are formatted to contain file systems.  Files live in
> file systems.
> 
> It's the same concept mapped as physical slices one way, as a pool of
> virtual extents the other way.
> 
> The two layers do mix and match - It's possible to put either entire
> drives or partitions into the volume group pool. Both levels work at
> their own level. Your example showed a disk divided into a 250 MB
> partition used to directly contain a file system (probably /boot) and
> the rest in the second partition that formed a volume group.
> 
> Those are the concepts.  Each layer has its own tools.  fdisk for
> partitions.  vgcreate/vgscan/vgextend/vgreduce/vgchange for volume
> groups.  lvcreate and the other lv* cmmands because that's the extra
> layer of virtualization.  Then both types return to the file system
> tools like mkfs.

Thanks, Doug.  What you wrote above should serve as a good conceptual overview. 

However, I'd still want to read a book or an online resource that explains things both conceptually and at a practitioner's level. Basically, I'd like to be able to troubleshoot my own problems. 

Here's one resource I found: 
http://docs.fedoraproject.org/en-US/Fedora/14/html/Storage_Administration_Guide/index.html

But skimming thru it tells me that this won't cover concepts in detail; it uses GUI versions of various tools is another thing. I tend to like O'reilly style presentation/coverage of a topic, and, it seems, there's no (current) book by O'reilly on LVM2. 

If you/others know of a good O'reilly type of self-learning resource, I'd like to hear about it. 

Also, I'm hoping I'd be able to do hands on exercises in a virtualized environment (VirtualBox, Xen, etc). If you know of any good tutorial that uses such a setup to teach you LVM, please do share.

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Thread

No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 03:29 -0700
  Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 11:46 +0100
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 04:08 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 12:36 +0100
        Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 05:25 -0700
          Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 13:49 +0100
            Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 06:09 -0700
              Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 19:18 +0100
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 11:49 -0700
              Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-12 18:27 +0000
              Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-12 18:51 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 12:12 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2012-04-12 17:15 -0400
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 20:30 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 06:58 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 07:13 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-13 19:29 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:27 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-14 07:58 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-14 06:35 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-14 19:59 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-14 19:58 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-14 20:13 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-15 15:14 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 02:39 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-16 08:50 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 08:02 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 10:39 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 11:08 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-16 15:58 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 23:02 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-17 10:58 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-18 21:53 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-19 16:45 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-19 18:34 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-20 17:19 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-21 20:37 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-25 16:01 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-28 16:32 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-16 19:15 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 21:20 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:40 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:56 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-16 18:47 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 20:19 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-13 15:22 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! J G Miller <miller@yoyo.ORG> - 2012-04-13 17:13 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:58 -0700
          Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 15:50 +0000
            Re: No success repairing my ext4 file system so far, PLEASE HELP! The Natural Philosopher <tnp@invalid.invalid> - 2012-04-12 21:37 +0100
      Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 15:46 +0000
        Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 09:35 -0700
          Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 18:57 +0000
  Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-12 15:59 +0000
    Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 16:39 +0000
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 09:53 -0700
        Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:03 +0000
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 09:48 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:07 +0000
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 18:43 +0100
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 10:55 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-12 18:07 +0000
        Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 19:20 +0100
          Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:11 +0000
            Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 20:39 +0100
              Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-13 16:50 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:24 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-16 19:04 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 21:44 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-17 17:18 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-17 18:41 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:09 +0000
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 10:46 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:13 +0000
        Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 12:21 -0700
          Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 20:12 +0000
  Re: No success repairing my ext4 file system so far, PLEASE HELP! g.fink@gmx.net (Gernot Fink) - 2012-04-12 18:20 +0000
  Re: No success repairing my ext4 file system so far, PLEASE HELP! The Natural Philosopher <tnp@invalid.invalid> - 2012-04-12 21:35 +0100
  Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-19 06:43 -0700
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Bob <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-19 11:29 -0500
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-19 18:50 -0700

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