[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Missing Disk Space or Partition

RR <ranjtech@gmail.com> writes:

> On Mon, Jan 24, 2011 at 12:07 AM, Carl Johnson <carlj@peak.org> wrote:
>> RR <ranjtech@gmail.com> writes:
>> > I see as more messages are pouring in, this message is getting pushed
>> down
>> > further and people won't even see it anymore. Does anyone have a personal
>> > doco, blog , cheatsheet for modifying the disk label  (and then I'm
>> assuming
>> > I'll have to recreate my partition table) but not losing my data? I have
>> > done this sort of stuff of destroying the partition table and re-creating
>> it
>> > by hand before without losing the data but I'm just very unfamiliar with
>> > this LVM beast and was wondering if someone could help at all?
>> If it is just a lvm problem, then you should first try running pvs, vgs,
>> and lvs.  Those will tell you what LVM thinks that it has.  Also you
>> should run 'fdisk -l /dev/sda' (or whatever disks you have) to see what
>> partitions your system thinks it has.  Man lvm should give you some
>> general information on the lvm commands, but you will probably need to
>> read the individual man pages for more detail on the commands.
> Hello Carl,
> I've posted all of that in the past emails in this thread, however for the
> benefit of new people seeing this message (esp. those not using gmail with
> the conversation mode set on) here's the info again

Sorry, I must have missed that before.

> lvm> pvs
>   PV         VG           Fmt  Attr PSize  PFree
>   /dev/sda2  DebSparcx64-01 lvm2 a-   43.21G    0
> shows the main partition to be 43.21GB and if /dev/sda1 is boot and
> /dev/sda2 is the lvm volume and /dev/sda2 is the "whole disk", then
> how/where do I extend this volume to?
> # lvs
>   LV     VG           Attr   LSize   Origin Snap%  Move Log Copy%  Convert
>   home   DebSparcx64-01 -wi-ao  30.47G
>   root   DebSparcx64-01 -wi-ao 264.00M
>   swap_1 DebSparcx64-01 -wi-ao   4.66G
>   tmp    DebSparcx64-01 -wi-ao 380.00M
>   usr    DebSparcx64-01 -wi-ao   4.66G
>   var    DebSparcx64-01 -wi-ao   2.79G
> # fdisk -l /dev/sda
> Disk /dev/sda (Sun disk label): 24 heads, 424 sectors, 8922 cylinders
> Units = cylinders of 10176 * 512 bytes
>    Device Flag    Start       End    Blocks   Id  System
> /dev/sda1             0        19     96672    1  Boot
> /dev/sda2            19      8924  45308640   8e  Linux LVM
> /dev/sda3             0      8924  45405312    5  Whole disk
> as per the above, /sda2 is extending from cylinder 19 to the last cylinder
> but it's coming u to only 43.21GB? Where did the rest of it go?

Everything looks entirely consistent, but it appears that your disk is
only about 45GB.

  sda  = 24*424*8922 = 90790272 sectors (512 bytes) = 45395136KB = 43.29GB
  sda2 = 24*424*8905 = 90617280 sectors = 45308640KB = about 43.21GB

I do see a couple of thing that might cause problems other than that.
Using overlapping partitions could cause problems, but I am surprised
that is even allowed.  You currently have sda3 which overlaps (contains)
both sda1 and sda2.  It also appears that sda1 ends on cylinder 19, but
sda2 also starts on cylinder 19.  If they are actually using partial
cylinders that might make sense, but I have never seen it before.  I
also see that fdisk reports 8922 cylinders for the disk but assigns 8925
cylinders (0-8924) to the partitions.

So, in summary I don't see any missing disk space.  If your disks are
actually 72GB it appears that you will have to tell fdisk what the
actual size is, but I would be very careful about doing that.  If you
really can do that, then you can resize lvm (pvresize and lvresize) and
ext3 filesystems.  If you make any mistakes on any of those you will
almost certainly have damaged filesystems and likely lost data.

Carl Johnson		carlj@peak.org

Reply to: